
Non-lethal weapons, also called nonlethal weapons, less-lethal weapons,
less-than-lethal weapons, non-deadly weapons, compliance weapons, or pain-inducing weapons are
weapon
A weapon, arm, or armament is any implement or device that is used to deter, threaten, inflict physical damage, harm, or kill. Weapons are used to increase the efficacy and efficiency of activities such as hunting, crime (e.g., murder), law ...
s intended to be
less likely to kill a living target than
conventional weapons such as
knives and
firearm
A firearm is any type of gun that uses an explosive charge and is designed to be readily carried and operated by an individual. The term is legally defined further in different countries (see legal definitions).
The first firearms originate ...
s with live
ammunition
Ammunition, also known as ammo, is the material fired, scattered, dropped, or detonated from any weapon or weapon system. The term includes both expendable weapons (e.g., bombs, missiles, grenades, land mines), and the component parts of oth ...
. It is often understood that unintended or incidental casualties are risked wherever force is applied; however, non-lethal weapons minimise the risk of casualties (e.g. serious/permanent injuries or death) as much as possible. Non-lethal weapons are used in
policing and
combat
Combat (French language, French for ''fight'') is a purposeful violent Conflict (process), conflict between multiple combatants with the intent to harm the opposition. Combat may be armed (using weapons) or unarmed (Hand-to-hand combat, not usin ...
situations to limit the
escalation of conflict where employment of lethal force is prohibited or undesirable, where rules of engagement require minimum casualties, or where policy restricts the use of conventional force. However, these weapons occasionally cause serious injuries or death due to allergic reactions, improper use and/or other factors; for this reason the term "less-lethal" has been preferred by some organizations as it describes the risks of death more accurately than the term "non-lethal", which some have argued is a
misnomer
A misnomer is a name that is incorrectly or unsuitably applied. Misnomers often arise because something was named long before its correct nature was known, or because an earlier form of something has been replaced by a later form to which the nam ...
.
Non-lethal weapons may be used by conventional military in a range of missions across the
force continuum. They may also be used by
military police
Military police (MP) are law enforcement agencies connected with, or part of, the military of a state. Not to be confused with civilian police, who are legally part of the civilian populace. In wartime operations, the military police may supp ...
, by
United Nations
The United Nations (UN) is the Earth, global intergovernmental organization established by the signing of the Charter of the United Nations, UN Charter on 26 June 1945 with the stated purpose of maintaining international peace and internationa ...
forces, and by
occupation forces for
peacekeeping
Peacekeeping comprises activities, especially military ones, intended to create conditions that favor lasting peace. Research generally finds that peacekeeping reduces civilian and battlefield deaths, as well as reduces the risk of renewed w ...
and stability operations. Non-lethal weapons may also be used to channelize a battlefield, control the movement of civilian populations, or to limit civilian access to restricted areas (as they were utilized by the
USMC's
1st Marine Expeditionary Force in
Somalia
Somalia, officially the Federal Republic of Somalia, is the easternmost country in continental Africa. The country is located in the Horn of Africa and is bordered by Ethiopia to the west, Djibouti to the northwest, Kenya to the southwest, th ...
in 1995). Similar weapons, tactics, techniques and procedures are employed by police forces domestically in
riot control
Riot control is a form of public order policing used by law enforcement, military, paramilitary or security forces to social control, control, disperse, and arrest people who are involved in a riot, unlawful Demonstration (people), demonstration ...
, prisoner control,
crowd control, refugee control, and
self-defense
Self-defense (self-defence primarily in Commonwealth English) is a countermeasure that involves defending the health and well-being of oneself from harm. The use of the right of self-defense as a legal justification for the use of Force (law), ...
, where the terminology of "less-than-lethal" is often used.
History
Military

In the past, military and police faced with undesirable escalation of conflict had few acceptable options. Military personnel guarding embassies often found themselves restricted to carrying unloaded weapons. National guards or policing forces charged with quelling
riot
A riot or mob violence is a form of civil disorder commonly characterized by a group lashing out in a violent public disturbance against authority, property, or people.
Riots typically involve destruction of property, public or private. The p ...
s were able to use only
batons or similar club-like weapons, or
bayonet or
sword
A sword is an edged and bladed weapons, edged, bladed weapon intended for manual cutting or thrusting. Its blade, longer than a knife or dagger, is attached to a hilt and can be straight or curved. A thrusting sword tends to have a straighter ...
charges, or fire
live ammunition at crowds. In the late 1980s and early 1990s, the Non-lethality Policy Review Group at U.S. Global Strategy Council in Washington and other independent
think tank
A think tank, or public policy institute, is a research institute that performs research and advocacy concerning topics such as social policy, political strategy, economics, military, technology, and culture. Most think tanks are non-governme ...
s around the world called for a concerted effort to develop weapons that were more life-conserving, environmentally friendly, and fiscally responsible than weapons available at that time. The U.S. Congress and other governments agreed and began an organized development of non-lethal weapons to provide a range of options between talking and shooting.
Recognizing the need to limit the escalation of force, research and development of a range of non-lethal weapons has since been undertaken internationally by governments and weapons manufacturers to fill the need for such weapons. Some non-lethal weapons may provide more effective riot control than firearms, truncheons or bayonets with less risk of loss of life or serious injury. Before the general availability of early military non-lethal weapons in the mid 1990s, war-fighters had few or no casualty-limiting options for the employment of scalable force and were continually at risk whenever lethal force was prohibited during sensitive missions.
In 2001, the
United States Marine Corps
The United States Marine Corps (USMC), also referred to as the United States Marines or simply the Marines, is the maritime land force service branch of the United States Department of Defense. It is responsible for conducting expeditionar ...
revealed its development of a less-than-lethal energy weapon called the
Active Denial System
The Active Denial System (ADS) is a directed-energy weapon developed by the United States armed forces, U.S. military, designed for area denial, perimeter security and crowd control. Informally, the weapon is also called the heat ray since it wo ...
, a focused high frequency microwave device said to be capable of heating all living matter in the target area rapidly and continuously for the duration of the beam, causing transient intolerable
pain
Pain is a distressing feeling often caused by intense or damaging Stimulus (physiology), stimuli. The International Association for the Study of Pain defines pain as "an unpleasant sense, sensory and emotional experience associated with, or res ...
but no lasting damage. The skin temperature of a person subjected to this weapon can jump to approximately in as little as 2 seconds depending on the skin's starting temperature. The system is nonlethal (the penetration of the beam into human skin is only a few millimeters).
In 2004, author Jon Ronson cited an unclassified military report titled "Non-Lethal Weapons: Terms and References" 21 acoustic weapons were listed, in various stages of development, including the Infrasound ("Very low-frequency sound which can travel long distances and easily penetrate most buildings and vehicles ... biophysical effects are projected to be: nausea, loss of bowels, disorientation, vomiting, potential internal organ damage or death may occur. Superior to ultrasound...)", however no such effects had been achieved .
In 2010, the ''Joint Non-Lethal Weapons Directorate Non-Lethal Weapons Reference Book'' was created. The weapons in this book are currently in development.
Police
Until the development of non-lethal weapons, police officers around the world had few if any non-lethal options for riot control. Common tactics used by police that were intended to be non-lethal or less lethal included a slowly advancing wall of men with batons, officers on horses trained to deal with policing situations, or a charge into a riot using the flats of sabers. Other reasonably successful approaches included shotguns with lower-powered cartridges, "salt shells", using
bean-bag rounds and ricocheting shots off of the ground. In the mid-20th century, with the integration of fire-control systems into major cities, police found that high-pressure fire hoses could be effective in dispersing a crowd (the use of
water cannon
A water cannon is a device that shoots a high-velocity stream of water. Typically, a water cannon can deliver a large volume of water, often over dozens of meters. They are used in firefighting, large vehicle washing, riot control, and mining. ...
s and
fire trucks has remained an effective non-lethal tactic to disperse riots). Trained
police dogs were also commonly used to scare and disperse rioters and apprehend individuals. In the 1980s the development of high-tensile plastics like
Kevlar
Kevlar (para-aramid) is a strong, heat-resistant synthetic fiber, related to other aramids such as Nomex and Technora. Developed by Stephanie Kwolek at DuPont in 1965, the high-strength material was first used commercially in the early 1970s as ...
and
Lexan
Polycarbonates (PC) are a group of thermoplastic polymers containing carbonate groups in their chemical structures. Polycarbonates used in engineering are strong, tough materials, and some grades are optically transparent. They are easily wor ...
revolutionized
personal armor and shields, and led to new tactics for riot squads and other special-purpose teams. Officers could now stand up against violent rioters throwing dangerous projectiles without having to resort to lethal methods to quickly disperse the danger. Coupled with the introduction of effective non-lethal chemical agents such as
tear gas
Tear gas, also known as a lachrymatory agent or lachrymator (), sometimes colloquially known as "mace" after the Mace (spray), early commercial self-defense spray, is a chemical weapon that stimulates the nerves of the lacrimal gland in the ey ...
and offensive-odor canisters, and non-lethal impact rounds such as
rubber bullets and "bean bag"
flexible baton round
Flexible may refer to:
Science and technology
* Power cord, a flexible electrical cable.
** Flexible cable, an Electrical cable
Electricity is the set of physical phenomena associated with the presence and motion of matter possessing an e ...
s, riot tactics were modified to rely less on violent response to attacking rioters than on a return to the slowly advancing wall, with supporting officers firing non-lethal ordnance into the crowd to discourage advance.
Police officers on patrol were traditionally armed with batons or pistols or both, and non-lethal methods of subduing an attacker centered on hand-fighting techniques such as
jujutsu
Jujutsu ( , or ), also known as jiu-jitsu and ju-jitsu (both ), is a Japanese martial art and a system of close combat that can be used in a defensive or offensive manner to kill or subdue one or more weaponless or armed and armored opponent ...
and baton use. In the 1980s and 1990s officers began deploying non-lethal personal sidearms such as
pepper spray
Pepper spray, oleoresin capsicum spray, OC spray, capsaicin spray, mace, or capsicum spray is a Tear gas, lachrymator (tear gas) product containing as its active ingredient the chemical compound capsaicin, which irritates the eyes with burning ...
s, and eventually
electroshock weapons such as
tasers, which were developed for use by police and also found a market in
self-defense
Self-defense (self-defence primarily in Commonwealth English) is a countermeasure that involves defending the health and well-being of oneself from harm. The use of the right of self-defense as a legal justification for the use of Force (law), ...
by private citizens. However, these weapons were developed for non-lethal resolution of one-on-one conflicts.
During the 1990s and early 2000s (decade), interest in various other forms of less-than-lethal weapons for military and police use rose. Amongst other factors, the use of less-than-lethal weapons may be legal under international law and treaty in situations where weapons such as aerosol sprays or gases defined as chemical are not.
Between the years of 1987–1990, after a three-year field study by the FBI's Firearms Training Unit; In 1990, the use of oleoresin capsicum was approved and used by the FBI, the first official law enforcement agency to do so.
In the late 1990s and early 2000s (decade), police began to adopt a new pepper spray delivery system based on the equipment used in
paintball
Paintball is a competitive sport, competitive team sport, team shooting sport in which players eliminate opponents from play by hitting them with spherical dye-filled gelatin capsules called Paintball equipment#Paintballs, paintballs that b ...
. A specialized paintball, called a "pepperball", is filled with liquid or powdered
capsaicin
Capsaicin (8-methyl-''N''-vanillyl-6-nonenamide) (, rarely ) is an active component of chili peppers, which are plants belonging to the genus ''Capsicum''. It is a potent Irritation, irritant for Mammal, mammals, including humans, and produces ...
, the active ingredient in pepper spray, and is propelled by compressed gas using a paintball marker similar to those used for the sport but operating at a higher pressure. The impact of the capsule is immediately painful (a pepperball's shell is thicker than a standard paintball and is fired at a higher velocity), and it breaks open on impact, dispersing the capsaicin with similar effect to aerosol-delivered pepper spray. However, to be most effective, pepper spray must contact the eyes, nose, or mouth of the target; pepper spray on clothing or tougher skin has a much reduced effect.
File:Soundweapon1.jpg, Long range acoustic device mounted on police vehicle, 2004 Republican National Convention, New York City
File:Kravallpolis.jpg, Swedish police in riot gear, carrying an extended telescopic baton
File:Taser-x26.jpg, A Taser X26 making an electrical arc between its two electrodes
File:US Navy 020821-N-8252B-003 During training, a U.S. Navy Master At Arms is sprayed with Oleoresin Capsicum, a non-lethal form of pepper spray for use in riot control.jpg, Pepper spray training
File:Exploded tear gas can on the fly.jpg, Exploded tear gas canister in the air
Effects
Non-lethal weapons have a design intent to provide an effect to reliably elicit a degree of incapacitation but without the typically lethal or permanent lasting effects of conventional weapons. This design intent has often made them a weapon of choice for use by law enforcement during civil protests, etc. Effect modalities vary by the technology being employed: kinetic projectiles function by blunt impact which actuate pain receptors to elicit a behavioral change, lights affect visual perception, acoustics affect hearing, etc.
Notwithstanding their design intent, non-lethal weapons can still cause harm. This is particularly true with certain technologies that interact with appropriately vulnerable regions; an example is kinetic munitions on the head, neck, eyes, abdominal and urogenital regions of the body.
As a result, some analysts describe "non-lethal" as a misnomer and recommend defining them as "less-lethal",
whereas other sources identify "non-lethal" as representing a goal of minimization of producing fatalities or permanent injuries
while not literally requiring minimization to a zero probability thereof.
Mechanics
Non-lethal weapons are intended to minimize injury or death. While people are occasionally seriously injured or killed by these weapons, fatalities are relatively infrequent. Causes of death from non-lethal weapons are varied and occasionally uncertain. Misplaced or ricocheting shots, pre-existing medical conditions, inadequate user training, repetitive applications and intentional misuse have been implicated in different cases where death has occurred.
As different parts of the body differ in vulnerability, and because people vary in weight and fitness, any weapon powerful enough to incapacitate may be capable of killing under certain circumstances. Thus, "non-lethal force" does have some risk of causing death: in this context, "non-lethal" means only "not ''intended'' to kill".
Several groups maintain there is great room for improvement in non-lethal weapons and procedures for their use. Claims for the relative safety of such weapons are usually contingent on their being used "properly". For example, the
rubber bullets developed during the 1960s were supposed to be fired at the ground and hit the target only after ricochet, and other non-lethal bullets are designed to be fired at the lower body; they can be lethal if fired directly at the head.
Ammunition
Non-lethal rounds are
firearm rounds which are designed to
incapacitate, but not kill, a target. The rounds rely on the transfer of kinetic energy and
blunt force trauma to accomplish this incapacitation.
Rubber bullets, rubber buckshot,
soft polymer rounds,
wax bullets,
plastic bullets,
beanbag rounds,
sponge grenades,
ring airfoil projectiles (both kinetic and tear gas projectiles) and
rubber bullets with electroshock effect (e.g.
Taser XREP rounds) are less lethal than conventional metal bullets, and are also propelled at lower speed by using less propellant. "Bean bag" type bullets are sometimes referred to as
flexible baton round
Flexible may refer to:
Science and technology
* Power cord, a flexible electrical cable.
** Flexible cable, an Electrical cable
Electricity is the set of physical phenomena associated with the presence and motion of matter possessing an e ...
s. More recently, high-velocity
paintball guns are also used to launch less-lethal rounds, including the
FN 303 launcher and PepperBall commercial products. There is also the Variable Velocity Weapon Concept, for which a propulsion energy source may not yet have been clearly established and/or finalized. In any case, all of these technologies apply the same basic mechanism, which is to launch a mass at the target that interacts kinetically.
File:Fiocchi rubber buckshot.jpg, Fiocchi 12-gauge rubber buckshot: containing 15, 8.3 mm, .58 gram rubber pellets, with a muzzle velocity of 790 fps.
File:Bean bag round close up.jpg, 12-gauge beanbag rounds and exposed bean bag round projectile
File:Sam234am.PNG, U.S. M234 launcher ring airfoil projectile rounds
Image:M234.png, Launcher, projectile, 64 mm, riot control, M234
Explosives
Hand grenade
A grenade is a small explosive weapon typically thrown by hand (also called hand grenade), but can also refer to a Shell (projectile), shell (explosive projectile) shot from the muzzle of a rifle (as a rifle grenade) or a grenade launcher. A mod ...
s come in several less-lethal varieties, such as
"flashbang" (stun) grenades,
"sting" grenades with rubber
shrapnel, and grenades designed to release chemical irritants (described below).
In 1972, stun grenades were used to capture the hijacked
Sabena Flight 571, allowing the Israeli forces headed by
Ehud Barak
Ehud Barak ( ; born Ehud Brog; 12 February 1942) is an Israeli former general and politician who served as the Prime Minister of Israel, prime minister from 1999 to 2001. He was leader of the Israeli Labor Party, Labor Party between 1997 and 20 ...
and including
Benjamin Netanyahu
Benjamin Netanyahu (born 21 October 1949) is an Israeli politician who has served as the prime minister of Israel since 2022, having previously held the office from 1996 to 1999 and from 2009 to 2021. Netanyahu is the longest-serving prime min ...
to storm the plane and take it over within 10 minutes. They captured two terrorists and killed Ali Taha, the leader of the terrorist group, and his aide, while rescuing all passengers (three were wounded and one died of her injuries several days later).
A stun grenade was apparently used by members of the
IHH against the
IDF soldiers during the
Gaza flotilla raid at the beginning of the IDF storming of the
Mavi Marmara.
In June 2010, in Kenya, a stun grenade was used to draw attention, and then a real grenade along with an explosive package were used, killing many people. In April, during the
2010 Kyrgyzstani uprising, police attempted to use stun grenades to stop a demonstration but the crowd overwhelmed the police. In March stun grenades were used by Belarusian police in
Minsk
Minsk (, ; , ) is the capital and largest city of Belarus, located on the Svislach (Berezina), Svislach and the now subterranean Nyamiha, Niamiha rivers. As the capital, Minsk has a special administrative status in Belarus and is the administra ...
against demonstrators, and in September they were used by Greek police in
Athens
Athens ( ) is the Capital city, capital and List of cities and towns in Greece, largest city of Greece. A significant coastal urban area in the Mediterranean, Athens is also the capital of the Attica (region), Attica region and is the southe ...
. In these latter two cases, the demonstrations were dispersed with no injuries.
In February 2011, stun grenades were seen used by Egyptian police against rioters.
Gases and sprays
Water
Water cannon
A water cannon is a device that shoots a high-velocity stream of water. Typically, a water cannon can deliver a large volume of water, often over dozens of meters. They are used in firefighting, large vehicle washing, riot control, and mining. ...
s are commonly used in crowd and riot control, for dispersal or to prevent movement on a particular position. These water cannons are intended to disperse crowds with little risk of harm, but the pressure can still cause eye injuries or even death. Water-filled rounds for small arms are in experimental stages.
Electrified water cannons were in development but was abandoned.
Scent-based weapons
Malodorants produce strong odours that cause people to leave the affected area. In 2008, the
Israeli Defence Forces began using
Skunk for crowd control. It is a form of mist sprayed from a water cannon, which leaves a terrible odor of rot or sewage on whatever it touches, and does not wash off easily.
Pepper spray
The active ingredient in
pepper spray
Pepper spray, oleoresin capsicum spray, OC spray, capsaicin spray, mace, or capsicum spray is a Tear gas, lachrymator (tear gas) product containing as its active ingredient the chemical compound capsaicin, which irritates the eyes with burning ...
is oleoresin capsicum (OC), an acrid irritant chemical derived from
cayenne pepper plants.
A 1998 estimate by the
International Association of Chiefs of Police suggested at least 113 pepper spray-related fatalities had occurred in the United States, all with aggravating factors such as intoxication, pre-existing health problems, or from the police use of airway-restrictive immobilizing holds that can cause
positional asphyxia
Positional asphyxia, also known as postural asphyxia, is a form of asphyxia which occurs when someone's position prevents the person from breathing adequately. People may die from positional asphyxia accidentally, when the mouth and nose are ...
. The Southern California chapter of the
American Civil Liberties Union
The American Civil Liberties Union (ACLU) is an American nonprofit civil rights organization founded in 1920. ACLU affiliates are active in all 50 states, Washington, D.C., and Puerto Rico. The budget of the ACLU in 2024 was $383 million.
T ...
recommends against maximal prone restraint techniques following pepper spray application, and they caution that anyone sprayed should be monitored to ensure effective breathing.
Tear gas

The use of chemical weapons such as
tear gas
Tear gas, also known as a lachrymatory agent or lachrymator (), sometimes colloquially known as "mace" after the Mace (spray), early commercial self-defense spray, is a chemical weapon that stimulates the nerves of the lacrimal gland in the ey ...
(
CS) and pepper spray (
OC) has come under increasing scrutiny and criticism due to studies showing serious long term side effects. Many police forces are no longer exposing their members to the chemicals during training.
Journalist
Rubén Salazar was killed in Los Angeles in 1970 by an errant CS gas canister during the
Chicano riots. Other serious injuries and fatalities have occurred from either tear gas itself or the projectiles it is delivered in, including the critical injury of veteran Scott Olsen from a tear gas canister during the 2011 Occupy Oakland protests.
Psychochemical
Psychochemical weapons are psychoactive drugs, such as
BZ,
LSD,
Kolokol-1,
EA-3167, and
3-Methylamphetamine designed to have a disorienting effect when used during combat or interrogation.
[Rózsa L 2009]
A psychochemical weapon considered by the Warsaw Pact: a research note. ''Substance Use & Misuse,'' 44, 172-178.
accessed: 27. 11. 2009.
Sleep gas
During the 2002
Moscow theater hostage crisis, Russian special forces used an unidentified gas (thought to be
3-methylfentanyl or another
fentanyl
Fentanyl is a highly potent synthetic piperidine opioid primarily used as an analgesic (pain medication). It is 30 to 50 times more Potency (pharmacology), potent than heroin and 50 to 100 times more potent than morphine. Its primary Medici ...
variant dissolved in halothane gas) in an attempt to induce sleep in both hostages and terrorists. Many of the hostages and terrorists (including all of the suicide bombers) were anesthetized, but some terrorists donned gas masks and thus were able to avoid the effects of the gas. Because the agent used was a potent Fentanyl derivative (a synthetic opioid), it causes respiratory depression and ultimately respiratory failure if administered in high enough dosages. The central nervous system effects, such as anesthesia and respiratory depression could have been reversed by an opioid antagonist such as
naloxone, which is stocked by hospitals and most ambulances. However, because the Russian authorities did not release any information regarding what type of agent was used, medical professionals were unaware that an opioid had been used during the rescue attempt and thus were unable to administer the antidote which could have saved most hostages. Approximately 700 hostages were rescued, while 130 died from exposure to the gas. All the terrorists were ultimately killed by Russian forces through some combination of gas exposure and gunfire.
Other chemical agents
Blister agents, including
CR gas, are less often used riot control agents. Other irritants include
CS gas
The compound 2-chlorobenzalmalononitrile (also called ''o''-chlorobenzylidene malononitrile; chemical formula: C10H5ClN2), a cyanocarbon, is the defining component of the lachrymatory agent commonly referred to as CS gas, a tear gas which ...
and
nonivamide (PAVA).
Sticky foam
Sticky foam was tried by the
U.S. Marine Corps in the peacekeeping
Operation United Shield in 1995 with some success, but as a result various complications in its field use were also discovered.
Area denial
Area denial weapons work by either incapacitating or deterring the enemy.
Anti-vehicle

Vehicle stoppers include a wide range of methods and devices meant to disable a vessel or vehicle to prevent attack by an oncoming vessel or vehicle or to stop that vessel or vehicle for evaluation. Vessel and vehicle stoppers may include kinetic, chemical, or electromagnetic means.
Anti-personnel
Caltrops
Simple rows or clusters of sharpened sticks (also known as
punji sticks), and the use of small
caltrops have been a feature of anti-
infantry
Infantry, or infantryman are a type of soldier who specialize in ground combat, typically fighting dismounted. Historically the term was used to describe foot soldiers, i.e. those who march and fight on foot. In modern usage, the term broadl ...
warfare for centuries.
[Weaponry: The Caltrop]
, Reid, Robert W., originally in ''Military History
Military history is the study of War, armed conflict in the Human history, history of humanity, and its impact on the societies, cultures and economies thereof, as well as the resulting changes to Politics, local and international relationship ...
'', August 1998 They are known to have been in use since Roman times and may have been used earlier: the concept was familiar to the 4th century BC Greeks, who used rocks, brush, nets and trees placed in the path of enemy conveyances on land or ensnarement devices hidden under water to achieve the same result: stop the enemy or suspected hostile in his tracks for examination or to prevent or limit incursions. Contemporary caltrops look something like large jacks from the childhood game. Placed in the path of oncoming wheeled or tracked vehicles, they are meant to foul wheels, destroy tires and tracks, and incapacitate vehicles.
[
However, due to the difficulty of mass-producing them in the pre-modern age, they were rarely used except in the defense of limited areas or chokepoints, especially during sieges, where they were used to help seal breaches. Increasing ease of production still did not prevent these methods from slowly falling out of favor from the late Middle Ages onward.]
Caltrops are still sometimes used in modern conflicts, such as during the Korean War
The Korean War (25 June 1950 – 27 July 1953) was an armed conflict on the Korean Peninsula fought between North Korea (Democratic People's Republic of Korea; DPRK) and South Korea (Republic of Korea; ROK) and their allies. North Korea was s ...
, where Chinese troops, often wearing only light shoes, were particularly vulnerable. In modern times, special caltrops are also sometimes used against wheeled vehicles with pneumatic tires. Some South American urban guerrillas as the Tupamaros and Montoneros called them "miguelitos" and used these as a tactic to avoid pursuit after ambushes.
Riot gun
In current usage a riot gun or less-lethal launcher is a type of firearm that is used to fire "non-lethal" or "less-lethal" ammunition for the purpose of suppressing riots. Less-lethal launchers may be special purpose firearms designed for riot control use, or standard firearms, usually shotguns and grenade launchers, adapted to riot control use with appropriate ammunition. The ammunition is most commonly found in 12 gauge (18.5 mm/.729 inch) shotguns and 37mm (1.46 inch) or 40mm (1.57 inch) grenade launchers.
In the United States
The United States of America (USA), also known as the United States (U.S.) or America, is a country primarily located in North America. It is a federal republic of 50 U.S. state, states and a federal capital district, Washington, D.C. The 48 ...
, the term "riot gun" more commonly refers to a riot shotgun that shoots baton rounds or bean bag rounds.
In recent years, law enforcement, military
A military, also known collectively as armed forces, is a heavily armed, highly organized force primarily intended for warfare. Militaries are typically authorized and maintained by a sovereign state, with their members identifiable by a d ...
and other security organizations sometimes use a type of paintball marker
A paintball marker, also known as a paintball gun, paint gun, or simply marker, is an air gun used in the shooting sport of paintball, and the main piece of paintball equipment. Paintball markers use compressed gas, such as carbon dioxide (CO2) ...
-like weapon that shoot frangible pepper-spray projectiles, which rupture upon impact and release chemical
A chemical substance is a unique form of matter with constant chemical composition and characteristic properties. Chemical substances may take the form of a single element or chemical compounds. If two or more chemical substances can be combin ...
aerosol
An aerosol is a suspension (chemistry), suspension of fine solid particles or liquid Drop (liquid), droplets in air or another gas. Aerosols can be generated from natural or Human impact on the environment, human causes. The term ''aerosol'' co ...
s that irritates the eyes and nose of nearby individuals. Such weapons are used generally in the role of stand-off weapons, where physical proximity to a suspect is deemed dangerous but deadly force
Deadly force, also known as lethal force, is the use of force that is likely to cause serious bodily injury or death to another person. In most jurisdictions, the use of deadly force is justified only under conditions of extreme necessity a ...
is not warranted. The irritant payload may differ from product to product but is usually a capsaicinoid powder called PAVA (capsaicin II), and less frequently a liquid
Liquid is a state of matter with a definite volume but no fixed shape. Liquids adapt to the shape of their container and are nearly incompressible, maintaining their volume even under pressure. The density of a liquid is usually close to th ...
or gas.
Electroshock weapons
Electroshock weapons are incapacitant weapons used for subduing a person by administering electric shock aimed at disrupting superficial muscle functions. One type is a conductive energy device (CED), an electroshock gun popularly known by the brand name " Taser", which fires projectiles that administer the shock through a thin, flexible wire. Other electroshock weapons such as stun guns, stun batons, and electroshock belts administer an electric shock by direct contact.
Directed energy weapons
Directed energy weapons are weapons that emit energy in an aimed direction without the means of a projectile. They are non-lethal and can immobilize people as well as machines (e.g. vehicles). Directed energy weapons include electromagnetic weapons, (including laser weapon
A laser weapon is a type of directed-energy weapon that uses lasers to inflict damage. Whether they will be deployed as practical, high-performance military weapons remains to be seen. One of the major issues with laser weapons is atmospheric ...
s) and microwave
Microwave is a form of electromagnetic radiation with wavelengths shorter than other radio waves but longer than infrared waves. Its wavelength ranges from about one meter to one millimeter, corresponding to frequency, frequencies between 300&n ...
weapons, particle beam weapons, sonic weapons and plasma weapon
A directed-energy weapon (DEW) is a ranged weapon that damages its target with highly focused energy without a solid projectile, including lasers, microwaves, particle beams, and sound beams. Potential applications of this technology include w ...
s.
Ultraviolet laser
HSV Technologies, Inc. (named for its founders, Herr, Schlesinger and Vernon; not to be confused with Holden Special Vehicles), formerly of San Diego, California
San Diego ( , ) is a city on the Pacific coast of Southern California, adjacent to the Mexico–United States border. With a population of over 1.4 million, it is the List of United States cities by population, eighth-most populous city in t ...
, USA, then Port Orchard, WA, designed a non-lethal device which was profiled in the 2002 ''TIME
Time is the continuous progression of existence that occurs in an apparently irreversible process, irreversible succession from the past, through the present, and into the future. It is a component quantity of various measurements used to sequ ...
'' magazine article "Beyond the Rubber Bullet". It is an electrolaser using ultraviolet
Ultraviolet radiation, also known as simply UV, is electromagnetic radiation of wavelengths of 10–400 nanometers, shorter than that of visible light, but longer than X-rays. UV radiation is present in sunlight and constitutes about 10% of ...
laser
A laser is a device that emits light through a process of optical amplification based on the stimulated emission of electromagnetic radiation. The word ''laser'' originated as an acronym for light amplification by stimulated emission of radi ...
beams of 193 nm, and promises to immobilize living targets at a distance without contact. There is plan for an engine-disabling variation for use against the electronic ignitions of cars using a 248 nm laser. The lead inventor, Eric Herr, died in 2008 and the company appears to have been dissolved, with their website defunct as of September 2017.
Pulsed energy projectile
Pulsed energy projectiles or (PEP) is a technology of non-lethal directed energy weaponry currently under development by the US military. It involves the emission of an invisible laser
A laser is a device that emits light through a process of optical amplification based on the stimulated emission of electromagnetic radiation. The word ''laser'' originated as an acronym for light amplification by stimulated emission of radi ...
pulse which, upon contact with the target, ablates the surface and creates a small amount of exploding plasma. This produces a pressure wave designed to stun the target and knock them off their feet, and electromagnetic radiation
In physics, electromagnetic radiation (EMR) is a self-propagating wave of the electromagnetic field that carries momentum and radiant energy through space. It encompasses a broad spectrum, classified by frequency or its inverse, wavelength ...
that affects nerve cells causing a painful sensation.
The pulsed energy projectile is intended for riot control
Riot control is a form of public order policing used by law enforcement, military, paramilitary or security forces to social control, control, disperse, and arrest people who are involved in a riot, unlawful Demonstration (people), demonstration ...
and is said to work over distances of up to 2 km. It weighs about 230 kg and will probably be mounted on vehicles. The weight could become lighter as laser production technology improves.
The system was developed by Mission Research Corporation (now owned by Orbital ATK). It uses a chemical deuterium fluoride laser device producing infrared
Infrared (IR; sometimes called infrared light) is electromagnetic radiation (EMR) with wavelengths longer than that of visible light but shorter than microwaves. The infrared spectral band begins with the waves that are just longer than those ...
laser pulses. The plasma (produced by the early part of the pulse) explodes because its electron
The electron (, or in nuclear reactions) is a subatomic particle with a negative one elementary charge, elementary electric charge. It is a fundamental particle that comprises the ordinary matter that makes up the universe, along with up qua ...
s absorb the energy of the later part of the pulse.
In 2003, a US military review reported that the electromagnetic radiation produced by PEPs had been shown to cause pain and temporary paralysis in animal experiments.
United States Special Operations Command FY 2010 plans included starting developmental work on a counter UAV pulsed energy projectile.
Active denial system
An active denial system
The Active Denial System (ADS) is a directed-energy weapon developed by the United States armed forces, U.S. military, designed for area denial, perimeter security and crowd control. Informally, the weapon is also called the heat ray since it wo ...
(ADS) is a dish that projects electromagnetic radiation just powerful enough to penetrate human skin and make the victim feel as though they are on fire, although no physical damage is done.
The ADS is a non-lethal, directed-energy weapon
A directed-energy weapon (DEW) is a ranged weapon that damages its target with highly focused energy without a solid projectile, including lasers, microwaves, particle beams, and sound beams. Potential applications of this technology include ...
developed by the US military, designed for area denial, perimeter security and crowd control. Informally, the weapon has also been referred to as a "heat ray",[Ross Kerber]
"Ray gun, sci-fi staple, meets reality"
''Boston Globe
''The Boston Globe,'' also known locally as ''the Globe'', is an American daily newspaper founded and based in Boston, Massachusetts. The newspaper has won a total of 27 Pulitzer Prizes. ''The Boston Globe'' is the oldest and largest daily new ...
'', September 24, 2004. since it works by heating the surface of targets, such as the skin of targeted human subjects.
In 2011, the ADS was redesigned to make it smaller, more reliable, and able to be used on the move. The ADS II is being designed to operate from moving aircraft, as well as moving ground vehicles. The redesign does not address problems in different environmental conditions.[Death Ray Turns Warm And Fuzzy](_blank)
– Strategypage.com, October 3, 2012
Air Force Special Operations Command is experimenting with mounting an ADS on the AC-130J Ghostrider gunship to target threatening crowds or individuals on the ground. This is to give the gunship a non-lethal option so the crew has more engagement options. Due to the increasing number of engagements in populated areas, the Air Force is aiming to field a system within 10 years to have enough aircraft available with non-lethal systems.[US Special Forces pursuing AC-130-based 'active denial system'](_blank)
- Flightglobal.com, 29 July 2015 The aircraft will apparently use the ADS II version.[AC-130J Gets A Ray Gun](_blank)
- Strategypage.com, 10 August 2015
Dazzler
A dazzler is a directed-energy weapon
A directed-energy weapon (DEW) is a ranged weapon that damages its target with highly focused energy without a solid projectile, including lasers, microwaves, particle beams, and sound beams. Potential applications of this technology include ...
intended to temporarily blind or disorient its target with intense directed radiation. Targets can include sensors or human vision. Dazzlers emit infrared
Infrared (IR; sometimes called infrared light) is electromagnetic radiation (EMR) with wavelengths longer than that of visible light but shorter than microwaves. The infrared spectral band begins with the waves that are just longer than those ...
or invisible light against various electronic sensors, and visible light
Light, visible light, or visible radiation is electromagnetic radiation that can be perceived by the human eye. Visible light spans the visible spectrum and is usually defined as having wavelengths in the range of 400–700 nanometres (nm ...
against humans, when they are intended to cause no long-term damage to eyes. The emitters are usually laser
A laser is a device that emits light through a process of optical amplification based on the stimulated emission of electromagnetic radiation. The word ''laser'' originated as an acronym for light amplification by stimulated emission of radi ...
s, making what is termed a ''laser dazzler''. Most of the contemporary systems are man-portable, and operate in either the red (a laser diode) or green (a diode-pumped solid-state laser, DPSS) areas of the electromagnetic spectrum
The electromagnetic spectrum is the full range of electromagnetic radiation, organized by frequency or wavelength. The spectrum is divided into separate bands, with different names for the electromagnetic waves within each band. From low to high ...
.
Initially developed for military use, non-military products are becoming available for use in law enforcement and security.
Weapons designed to cause permanent blindness are banned by the 1995 United Nations
The United Nations (UN) is the Earth, global intergovernmental organization established by the signing of the Charter of the United Nations, UN Charter on 26 June 1945 with the stated purpose of maintaining international peace and internationa ...
Protocol on Blinding Laser Weapons. The dazzler is a non-lethal weapon
A weapon, arm, or armament is any implement or device that is used to deter, threaten, inflict physical damage, harm, or kill. Weapons are used to increase the efficacy and efficiency of activities such as hunting, crime (e.g., murder), law ...
intended to cause temporary blindness or disorientation and therefore falls outside this protocol.
The personnel halting and stimulation response rifle (PHASR) is a prototype non-lethal laser
A laser is a device that emits light through a process of optical amplification based on the stimulated emission of electromagnetic radiation. The word ''laser'' originated as an acronym for light amplification by stimulated emission of radi ...
dazzler developed by the Air Force Research Laboratory's Directed Energy Directorate, U.S. Department of Defense. Its purpose is to temporarily disorient and blind a target. Blinding laser weapons have been tested in the past, but were banned under the 1995 UN Protocol on Blinding Laser Weapons, which the United States acceded to on 21 January 2009. The PHASR rifle, a low-intensity laser, is not prohibited under this regulation, as the blinding effect is intended to be temporary. It also uses a two-wavelength laser. The PHASR was tested at Kirtland Air Force Base, part of the Air Force Research Laboratory
The Air Force Research Laboratory (AFRL) is a scientific research and development detachment of the United States Air Force Air Force Materiel Command, Materiel Command dedicated to leading the discovery, development, and integration of direct- ...
Directed Energy Directorate in New Mexico
New Mexico is a state in the Southwestern United States, Southwestern region of the United States. It is one of the Mountain States of the southern Rocky Mountains, sharing the Four Corners region with Utah, Colorado, and Arizona. It also ...
.
Blinding laser weapons
Several nations developed blinding laser weapons and they were allegedly used during the war in Donbas by Russia.
Long Range Acoustic Device
The Long Range Acoustic Device (LRAD) is an acoustic hailing device developed by LRAD Corporation to send messages and warning tones over longer distances or at higher volume than normal loudspeaker
A loudspeaker (commonly referred to as a speaker or, more fully, a speaker system) is a combination of one or more speaker drivers, an enclosure, and electrical connections (possibly including a crossover network). The speaker driver is an ...
s. LRAD systems are used for long-range communications in a variety of applications including as a means of non-lethal, non-kinetic crowd control. Though they have been called "sonic weapons", LRADs are not inherently for military use. The round black devices on top of New York City police Hummers are LRADs.
According to the manufacturer's specifications, the systems weigh from and can emit sound in a 30°- 60° beam at 2.5 kHz. The manufacturer also produces systems for public address and mass notification use that broadcast 360°.
Safety and legal status
In the United States, the University of Texas-Austin Institute for Advanced Technology (IAT) conducts basic research to advance electrodynamics and hypervelocity physics related to electromagnetic weapons.
Although generally considered "non-lethal weapons", electromagnetic weapons do pose health threats to humans. In fact, "non-lethal weapons can sometimes be deadly."
United States Department of Defense
The United States Department of Defense (DoD, USDOD, or DOD) is an United States federal executive departments, executive department of the federal government of the United States, U.S. federal government charged with coordinating and superv ...
policy explicitly states that non-lethal weapons "shall not be required to have a zero probability of producing fatalities or permanent injuries." Although a Human Effects Advisory Panel was established in 1998 to provide independent assessment on human effects, data, and models for the use of 'non-lethal weapons' on the general population, the TECOM Technology Symposium in 1997 concluded on non-lethal weapons: "Determining the target effects on personnel is the greatest challenge to the testing community," primarily because "the potential of injury and death severely limits human tests." However, " directed energy weapons that target the central nervous system and cause neurophysiological disorders" may violate the Convention on Certain Conventional Weapons of 1980. And weapons that go beyond non-lethal intentions and cause "superfluous injury or unnecessary suffering" could violate the Protocol I
Protocol I (also Additional Protocol I and AP I) is a 1977 amendment Protocol (diplomacy), protocol to the Geneva Conventions concerning the protection of civilian casualty, civilian victims of international war, including "armed conflicts in ...
to the Geneva Conventions
upright=1.15, The original document in single pages, 1864
The Geneva Conventions are international humanitarian laws consisting of four treaties and three additional protocols that establish international legal standards for humanitarian t ...
of 1977." Safety and evaluation of the physical and psychological effects of the long-term or repetitive uses of the pain
Pain is a distressing feeling often caused by intense or damaging Stimulus (physiology), stimuli. The International Association for the Study of Pain defines pain as "an unpleasant sense, sensory and emotional experience associated with, or res ...
-inducing non-lethal weapons on humans have not been well understood or studied in any great details. Any such studies require explicit consent of all participants so as not to violate the UN Convention against torture and other cruelties.
Misuse
Pepper spray is one non-lethal weapon alleged to have been misused by American police. In two incidents in California in 1997, police swabbed pepper spray directly into the eyes of protesters.
USA: Police use of pepper spray - tantamount to torture
'. Amnesty International
Amnesty International (also referred to as Amnesty or AI) is an international non-governmental organization focused on human rights, with its headquarters in the United Kingdom. The organization says that it has more than ten million members a ...
, 4 November 1997. Amnesty International
Amnesty International (also referred to as Amnesty or AI) is an international non-governmental organization focused on human rights, with its headquarters in the United Kingdom. The organization says that it has more than ten million members a ...
condemned these actions, and claimed that they were likely a violation of the 1984 United Nations Convention Against Torture.
Terrorism concerns
Loren Thompson, chief operating officer of the Lexington Institute in Virginia states that: "The relevant (electromagnetic weapon) technology is well within the grasp of some countries and transnational terrorist
Terrorism, in its broadest sense, is the use of violence against non-combatants to achieve political or ideological aims. The term is used in this regard primarily to refer to intentional violence during peacetime or in the context of war aga ...
groups", and further states that U.S. hardware is susceptible to microwave and other directed-energy weapons.
Suitable materials and tools to create electromagnetic weapons are commonly available. "The threat of electromagnetic bomb proliferation is very real."
See also
* Demoralization (warfare)
Demoralization is, in a context of warfare, national security, and law enforcement, a process in psychological warfare with the objective to erode morale among enemy combatants and/or noncombatants. That can encourage them to retreat, surr ...
* Electronic warfare
* Gas pistol
A gas pistol is a non-lethal weapon, non-lethal weapon used for self-defense and other purposes. It is typically a close-to-exact replica or conversion of a traditional handgun made to be able to fire Blank (cartridge), blanks or tear gas cartri ...
* LED Incapacitator
* Net gun
* New physical principles weapons
* Pain compliance
* Peroneal strike (hand-to-hand technique)
* R.I.P. cartridge
* Stun belt
* Tranquillizer gun
Notes
External links
Council on Foreign Relations Independent Task Force Report on Nonlethal Weapons
Weapons of Mass Protection, Air Force Journal article on Nonlethal Weapons.
The Sunshine Project, 'Non-Lethal' Incapacitating (Bio)Chemical Weapons (website)
Centre for Conflict Resolution, Department of Peace Studies, Bradford Non-Lethal Weapons Research Project (BNLWRP), Research Report No. 8
Less-Lethal.org - Non Lethal and Less Lethal Law Enforcement Technologies
Hosted by the International Association of Chiefs of Police (IACP).
US Deptment of Defense Non-Lethal Weapons Program
*
{{DEFAULTSORT:Non-Lethal Weapon
Anti-personnel weapons
Area denial weapons
Incapacitating agents
Law enforcement equipment
Law enforcement techniques
Military equipment
Peacekeeping