Private Investigator
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A private investigator (often abbreviated to PI; also known as a private detective, an inquiry agent or informally a private eye) is a person who can be hired by individuals or groups to undertake investigatory law services. Private investigators often work for attorneys in civil and criminal cases.


History

In 1833, Eugène François Vidocq, a French
soldier A soldier is a person who is a member of an army. A soldier can be a Conscription, conscripted or volunteer Enlisted rank, enlisted person, a non-commissioned officer, a warrant officer, or an Officer (armed forces), officer. Etymology The wo ...
, criminal, and privateer, founded the first known private detective agency, "Le Bureau des Renseignements Universels pour le commerce et l'Industrie" ("The Office of Universal Information For Commerce and Industry") and hired ex-convicts. Much of what private investigators did in the early days was to act as the police in matters for which their clients felt the police were not equipped or willing to do. Official law enforcement tried many times to shut it down. In 1842, police arrested him in suspicion of unlawful imprisonment and taking money on false pretences after he had solved an
embezzlement Embezzlement (from Anglo-Norman, from Old French ''besillier'' ("to torment, etc."), of unknown origin) is a type of financial crime, usually involving theft of money from a business or employer. It often involves a trusted individual taking ...
case. Vidocq later suspected that it had been a set-up. He was sentenced to five years and fined 3,000 francs, but the Court of Appeals released him. Vidocq is credited with having introduced record-keeping,
criminology Criminology (from Latin , 'accusation', and Ancient Greek , ''-logia'', from λόγος ''logos'', 'word, reason') is the interdisciplinary study of crime and deviant behaviour. Criminology is a multidisciplinary field in both the behaviou ...
, and
ballistics Ballistics is the field of mechanics concerned with the launching, flight behaviour and impact effects of projectiles, especially weapon munitions such as bullets, unguided bombs, rockets and the like; the science or art of designing and acceler ...
to criminal investigation. He made the first plaster casts of shoe impressions. He created indelible ink and unalterable bond paper with his printing company. His form of anthropometrics is still partially used by French police. He is also credited for philanthropic pursuits – he claimed he never informed on anyone who had stolen for real need. In the United Kingdom, Charles Frederick Field set up an enquiry office upon his retirement from the Metropolitan Police in 1852. Field became a friend of
Charles Dickens Charles John Huffam Dickens (; 7 February 1812 – 9 June 1870) was an English novelist, journalist, short story writer and Social criticism, social critic. He created some of literature's best-known fictional characters, and is regarded by ...
, and the latter wrote articles about him. In 1862, one of his employees, the Hungarian Ignatius Paul Pollaky, left him and set up a rival agency. Although little-remembered today, Pollaky's fame at the time was such that he was mentioned in various books of the 1870s and immortalized as "Paddington" Pollaky for his "keen penetration" in the 1881 comic opera, ''Patience''. In the United States, Allan Pinkerton established the Pinkerton National Detective Agency – a private detective agency – in 1850. Pinkerton became famous when he foiled a plot to assassinate then President-elect
Abraham Lincoln Abraham Lincoln (February 12, 1809 – April 15, 1865) was the 16th president of the United States, serving from 1861 until Assassination of Abraham Lincoln, his assassination in 1865. He led the United States through the American Civil War ...
in 1861. Pinkerton's agents performed services which ranged from undercover investigations and detection of crimes, to plant protection and armed security. At the height of its existence, the number of Pinkerton National Detective Agency active agents and reserves rivaled the number of active soldiers and reserves in the
United States Army The United States Army (USA) is the primary Land warfare, land service branch of the United States Department of Defense. It is designated as the Army of the United States in the United States Constitution.Article II, section 2, clause 1 of th ...
. Allan Pinkerton hired Kate Warne in 1856 as a private detective, making her the first female private detective in America. A larger role for this new private investigative industry was to assist companies in labor disputes. Some early private investigators provided armed guards to act as a private militia. During the union unrest in the US in the late 19th century, industrialists would hire Pinkerton agents as undercover operatives to infiltrate and disrupt union activity or serve as armed guards for factories. In the aftermath of the Homestead Riot of 1892, several states passed so-called "anti-Pinkerton" laws restricting the importation of private security guards during union strikes. The federal Anti-Pinkerton Act of 1893 continues to prohibit an "individual employed by the Pinkerton Detective Agency, or similar organization" from being employed by "the Government of the United States or the government of the District of Columbia." Pinkerton agents were also hired to track western outlaws
Jesse James Jesse Woodson James (September 5, 1847April 3, 1882) was an American outlaw, Bank robbery, bank and Train robbery, train robber, guerrilla and leader of the James–Younger Gang. Raised in the "Little Dixie (Missouri), Little Dixie" area of M ...
, the Reno brothers, and the Wild Bunch, including
Butch Cassidy Robert LeRoy Parker (April 13, 1866 – November 7, 1908), better known as Butch Cassidy, was an American train robbery, train and bank robbery, bank robber and the leader of a gang of criminal outlaws known as the "Butch Cassidy's Wild Bunch, ...
and the Sundance Kid.


Employment

Many private detectives/investigators with special academic and practical experience often work with defense attorneys on
capital punishment Capital punishment, also known as the death penalty and formerly called judicial homicide, is the state-sanctioned killing of a person as punishment for actual or supposed misconduct. The sentence (law), sentence ordering that an offender b ...
and other criminal defense cases. Others are insurance investigators who investigate suspicious claims. Before the advent of no-fault divorce, many private investigators sought evidence of adultery or other conduct within marriage to establish grounds for a divorce. Despite the lack of legal necessity for such evidence in many jurisdictions, according to press reports, collecting evidence of spouses' and partners' adultery or other "bad behaviour" is still one of their most profitable undertakings, as the stakes being fought over now are child custody, alimony, or marital property disputes. Private investigators can also perform due diligence for an investor considering investing with an investment group, fund manager, or other high-risk business or investment venture. This could help the prospective investor avoid being the victim of fraud. A licensed and experienced investigator could reveal the investment is risky and/or the investor has a suspicious background. This is called investigative due diligence, and is becoming more prevalent in the 21st century with the public reports of large-scale
Ponzi scheme A Ponzi scheme (, ) is a form of fraud that lures investors and pays Profit (accounting), profits to earlier investors with Funding, funds from more recent investors. Named after Italians, Italian confidence artist Charles Ponzi, this type of s ...
s and other fraudulent investment vehicles. There are also cases of
corrupt Corruption is a form of dishonesty or a criminal offense that is undertaken by a person or an organization that is entrusted in a position of authority to acquire illicit benefits or abuse power for one's gain. Corruption may involve activities ...
private detectives who, at times, have been known to work for criminals such as stalkers and
crime boss A crime boss, also known as a crime lord, mafia don, mob boss, kingpin, or godfather is the leader of a criminal organization. Description A crime boss has absolute or nearly absolute control over the other members of the organization and is ...
es to track down escaped victims, rival criminals and/or
witness In law, a witness is someone who, either voluntarily or under compulsion, provides testimonial evidence, either oral or written, of what they know or claim to know. A witness might be compelled to provide testimony in court, before a grand jur ...
es that have gone into hiding or to gather compromising evidence against witnesses,
informants An informant (also called an informer or, as a slang term, a "snitch", "rat", "canary", "stool pigeon", "stoolie", "tout" or "grass", among other terms) is a person who provides privileged information, or (usually damaging) information inten ...
, prosecutors and/or police investigators that could be used in upcoming trials.


Responsibilities

Private investigators also engage in a variety of work not often associated with the industry in the mind of the public. For example, many are involved in process serving, the personal delivery of summons, subpoenas, and other legal documents to parties in a legal case. The tracing of absconding debtors can also form a large part of a PI's work load. Many agencies specialize in a particular field of expertise. For example, some PI agencies deal only in tracing. A handful of firms specialize in
technical surveillance counter-measures Countersurveillance refers to measures that are usually undertaken by the public to prevent surveillance, including covert surveillance. Countersurveillance may include electronic methods such as technical surveillance counter-measures, which is t ...
, sometimes called electronic counter measures, which is the locating and dealing with unwanted forms of electronic surveillance (for example, a bugged boardroom for industrial espionage purposes). This niche service is typically conducted by those with backgrounds in intelligence/counterintelligence, executive protection, and a small number from law enforcement entities whose duties included the covert installation of eavesdropping devices as a tool in organized crime, terrorism and narco-trafficking investigations. Other PIs, also known as corporate investigators, specialize in corporate matters, including antifraud work, loss prevention, internal investigations of employee misconduct (such as Equal Employment Opportunities violations and sexual harassment), the protection of
intellectual property Intellectual property (IP) is a category of property that includes intangible creations of the human intellect. There are many types of intellectual property, and some countries recognize more than others. The best-known types are patents, co ...
and
trade secret A trade secret is a form of intellectual property (IP) comprising confidential information that is not generally known or readily ascertainable, derives economic value from its secrecy, and is protected by reasonable efforts to maintain its conf ...
s, antipiracy,
copyright infringement Copyright infringement (at times referred to as piracy) is the use of Copyright#Scope, works protected by copyright without permission for a usage where such permission is required, thereby infringing certain exclusive rights granted to the c ...
investigations, due diligence investigations, malware and cyber criminal activity, and computer forensics work. Some PIs act as professional witnesses where they observe situations with a view to reporting the actions or lack of them to a court or to gather evidence in antisocial behavior.


Undercover investigator

An undercover investigator, undercover detective, or undercover agent is a person who conducts investigations of suspected or confirmed criminal activity while impersonating a disinterested third party. Undercover investigators often infiltrate a suspected insurgent group, posing as a person interested in purchasing illegal goods or services with the ultimate aim of obtaining information about their assigned target. Many undercover investigators carry
hidden camera A hidden camera or spy camera is a camera used to photograph or record subjects, often people, without their knowledge. The camera may be considered "hidden" because it is not visible to the subject being filmed, or is disguised as another obje ...
s and recorders strapped to their bodies to help them document their investigations. The period of the investigation could last for several months, or in some extreme cases, years. Due to the dangerous nature of the job, their real identities are typically kept secret throughout their active careers. Economic investigations, business intelligence and information on competitors, security advice, special security services information, criminal investigation, investigations background, and profile polygraph tests are all typical examples of such a role. Certain types of undercover investigators, depending on their employer, will investigate allegations of abuse of workman's compensation. Those claiming to be injured are often investigated and recorded with a hidden camera/recorder. This is then presented in court or to the client who paid for the investigation.


Around the world

Many jurisdictions require PIs to be licensed. Depending on local laws, they may or may not carry a
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 ...
. Equipment can vary greatly, but generally involves a wide variety of surveillance equipment and recording devices. While PIs may investigate criminal matters, they typically do not hold any law enforcement authority by virtue of the position, regardless of licensure. Private investigators’ authority is usually identical to other citizens’ (off-duty or retired law enforcement officers serving as a PI may retain their police powers at all times, depending on the jurisdiction). They are expected to keep detailed notes and to be prepared to testify in court regarding any of their observations on behalf of their clients, irregular hours may also be required when performing surveillance work. Great care is required to remain within the scope of the law; otherwise, the private investigator may face criminal charges. However, there are also cases around the world, of corrupt or rogue private investigators who have obtained people's private data and information through illegal means. These include phone hacking, pretexting, identity theft and other illegal means of accessing government, insurance and police databases to obtain highly sensitive private information on their targets.


Australia

Private investigators in Australia must be licensed by the licensing authority relevant to the state where they are located. This applies to all states except the Australian Capital Territory. Companies offering investigation services must also hold a business licence and all their operatives must hold individual licences. Generally, the licences are administered and regulated by the state police; however, in some states, this can also be managed by other government agencies. The evidence collected by private investigators must adhere to strict rules of admissibility. If proper protocols are not followed during the investigation services, the evidence may be deemed inadmissible in the court of law. To become registered in New South Wales requires a Class 2E licence, which can be applied for through the NSW Fair Trading website. The Australian Capital Territory does not require PIs to be licensed, although they are still bound by legislation. PIs working in the ACT cannot enter the NSW area without a CAPI license, else they will be in breach of the law. In Queensland, a private investigator need to be licensed under the
Queensland Government The Queensland Government is the state government of Queensland, Australia, a Parliament, parliamentary constitutional monarchy. Government is formed by the party or coalition that has gained a majority in the Queensland Legislative Assembly, ...
and apply for a private investigator licence by completing an application for a security provider licence. Applicant will need to have a criminal history check and submit fingerprint.


Canada

Private investigators in Canada are licensed at the provincial level by the appropriate body. For instance, in the province of
Ontario Ontario is the southernmost Provinces and territories of Canada, province of Canada. Located in Central Canada, Ontario is the Population of Canada by province and territory, country's most populous province. As of the 2021 Canadian census, it ...
, private investigators are licensed and regulated by the Ministry of Community Safety & Correctional Services (MCSCS). In the province of
Alberta Alberta is a Provinces and territories of Canada, province in Canada. It is a part of Western Canada and is one of the three Canadian Prairies, prairie provinces. Alberta is bordered by British Columbia to its west, Saskatchewan to its east, t ...
, private investigators are licensed and regulated by the Alberta Justice and Solicitor General. Similar licensing requirements apply in other
provinces and territories of Canada Canada has ten provinces and three territories that are sub-national administrative divisions under the jurisdiction of the Constitution of Canada, Canadian Constitution. In the 1867 Canadian Confederation, three provinces of British North Amer ...
. As per the
Ontario Ontario is the southernmost Provinces and territories of Canada, province of Canada. Located in Central Canada, Ontario is the Population of Canada by province and territory, country's most populous province. As of the 2021 Canadian census, it ...
text of th
Private Security and Investigative Services Act of 2005
private investigators are forbidden from referring to themselves as detective or private detective. In order to become a licensed private investigator, you must be 18 years of age or older in
Ontario Ontario is the southernmost Provinces and territories of Canada, province of Canada. Located in Central Canada, Ontario is the Population of Canada by province and territory, country's most populous province. As of the 2021 Canadian census, it ...
(in other
Provinces and territories of Canada Canada has ten provinces and three territories that are sub-national administrative divisions under the jurisdiction of the Constitution of Canada, Canadian Constitution. In the 1867 Canadian Confederation, three provinces of British North Amer ...
the eligible age to work may be higher); have a clean criminal record or obtain a waiver; and submit a correctly completed application for a license. You are required to complete 50-hours of basic training with an accredited source such as a university, college, or through private agencies licensed to administer the course. Upon completion of basic training, individuals are required to write and pass the basic test to obtain a private investigator's license


UK

In 2001, the Private Security Industry Act empowered the Security Industry Authority (SIA) to introduce licensing for private investigators in the United Kingdom. Although the SIA regulates various other sectors of the private security industry, the specific licensing framework for private investigators has never been fully implemented, and remains unimplemented as of January 2025. As a result, there is no government-backed licensing scheme for private investigators in the UK. The SIA has periodically announced potential dates for when private investigator licensing might take effect, including a proposal for discussion in Parliament in May 2015. However, no formal scheme has emerged. In December 2014, Corporate Livewire published an article by a UK private investigator at BAR Investigations, discussing the implications of the unimplemented licensing regime and other industry concerns. The cost of hiring a private investigator in the UK varies according to the complexity of the inquiry and the investigator’s level of experience, with typical daily rates ranging from £200 to £500.


United States

Private investigators in the United States may or may not be licensed or registered by a government licensing authority or state police of the state where they are located. Licensing varies from state to state and can range from: a) no state license required; b) city or state business license required (such as in five states (
Idaho Idaho ( ) is a landlocked U.S. state, state in the Pacific Northwest and Mountain states, Mountain West subregions of the Western United States. It borders Montana and Wyoming to the east, Nevada and Utah to the south, and Washington (state), ...
,
Alaska Alaska ( ) is a non-contiguous U.S. state on the northwest extremity of North America. Part of the Western United States region, it is one of the two non-contiguous U.S. states, alongside Hawaii. Alaska is also considered to be the north ...
,
Mississippi Mississippi ( ) is a U.S. state, state in the Southeastern United States, Southeastern and Deep South regions of the United States. It borders Tennessee to the north, Alabama to the east, the Gulf of Mexico to the south, Louisiana to the s ...
,
South Dakota South Dakota (; Sioux language, Sioux: , ) is a U.S. state, state in the West North Central states, North Central region of the United States. It is also part of the Great Plains. South Dakota is named after the Dakota people, Dakota Sioux ...
, and
Wyoming Wyoming ( ) is a landlocked U.S. state, state in the Mountain states, Mountain West subregion of the Western United States, Western United States. It borders Montana to the north and northwest, South Dakota and Nebraska to the east, Idaho t ...
); c) to needing several years of experience and licensing-related training classes and testing (as is the case with
Virginia Virginia, officially the Commonwealth of Virginia, is a U.S. state, state in the Southeastern United States, Southeastern and Mid-Atlantic (United States), Mid-Atlantic regions of the United States between the East Coast of the United States ...
, West Virginia, and
California California () is a U.S. state, state in the Western United States that lies on the West Coast of the United States, Pacific Coast. It borders Oregon to the north, Nevada and Arizona to the east, and shares Mexico–United States border, an ...
). In some states (Indiana, Michigan, Rhode Island), work experience can be substituted with a bachelor's degree in criminal justice. In many states, companies offering investigation services must hold an agency license, and all of their investigators or detectives must hold individual licenses or registrations; furthermore, certain states such as Washington have separate classes of licensing for roles such as trainers of private investigators, individual private investigators, and private investigative agencies. A few states require character references from people not related to the applicant by blood or marriage (3 in Massachusetts, 5 in Minnesota). A few reciprocity agreements allow a US private investigator working in one state to continue work in another for a limited time without getting a separate license, but not all states participate in these agreements. In 1887,
Colorado Colorado is a U.S. state, state in the Western United States. It is one of the Mountain states, sharing the Four Corners region with Arizona, New Mexico, and Utah. It is also bordered by Wyoming to the north, Nebraska to the northeast, Kansas ...
became the first state in the union to institute licensing requirements for private investigators. Section 12-21-101 of the 1973 edition of Colorado Revised Statutes mandated license for "detective business", section 12-21-109 declared unlicensed operation a misdemeanor. However, on February 7, 1977, after El Paso County challenged a local security company Ro'Mar Investigation and Security, Inc.'s right to conduct investigations without a license, the Colorado Supreme Court deemed the law unconstitutional in People v. Ro'Mar, citing that the statute did not define a "detective business" and the Secretary of State lacked the ability to define it by rule. Following this, several private investigators formed Professional Private Investigators Association of Colorado (PPIAC) in order to try to get the licensing laws reinstated, but the bills died in the General Assembly. Four reviews carried out by the Colorado Department of Regulatory Agencies in 1985, 1987, 2000 and 2006 recommended against state regulation due to the lack to harm to consumers. On June 10, 2011,
Governor A governor is an politician, administrative leader and head of a polity or Region#Political regions, political region, in some cases, such as governor-general, governors-general, as the head of a state's official representative. Depending on the ...
John Hickenlooper John Wright Hickenlooper Jr. ( ; born February 7, 1952) is an American politician, geologist, and businessman serving as the Seniority in the United States Senate, junior United States Senate, United States senator from Colorado since 2021. A mem ...
signed into law Colorado House Bill 1195, which reinstated licenses for private investigators on voluntary basis effective July 1, 2012. A license applicant would have to be of 21 years of age or older, hold United States citizenship and have at least 4,000 hours of work experience as an investigator or part of a local, state or federal law enforcement agency; or 2,000 hours with post-secondary education. On June 6, 2014, Hickenlooper signed into law Senate Bill 133, which effective June 1, 2015, made licensure mandatory. This split the licenses into two categories: Class I, requiring the applicant to be 21 years of age or older, hold United States citizenship and pass the Colorado Jurisprudence Exam. Class II requires in addition to Class I requirements a minimum of 4,000 hours of work experience as an investigator or part of a local, state or federal law enforcement agency. In 2019, following a review, the Colorado Department of Regulatory Agencies' Office of Policy, Research and Regulatory Reform suggested licensure requirement elimination, predicting "little to no consumer harm". In June 2020, Governor
Jared Polis Jared Schutz Polis ( ; ; born May 12, 1975) is an American politician and businessman serving as the 43rd governor of Colorado since 2019. He served one term on the Colorado State Board of Education from 2001 to 2007, and five terms as the Unite ...
vetoed House Bill 1207 to keep licensure requirements, causing the licensure requirements to expire on August 31, 2021. Florida has 3 types of licenses: Class CC for private investigator intern, C for private investigator, and MA for manager of a private investigative agency. As Class C license requires at least two years of experience, most applicants start with Class CC, which allows them to work under a sponsorship of a licensed Class C investigator. For a Private Investigator License in New York, an investigator needs three years of verifiable experience, and to pass a NY State Department of State Division of licensing Services exam. In 1893 a federal law was passed explicitly barring the government from employing the Pinkerton Detective Agency or a similar agency.


Vietnam

Current Vietnamese law stipulates that investigation is the authority of state agencies. According to the Investment Law and Decrees 108/2006/NĐ-CP and 52/2008/NĐ-CP, businesses providing security services are not allowed to conduct investigations or private detective activities in any form. However, due to social demand, private detective offices have rapidly developed. Recently, private detective services have grown significantly, primarily in the form of information provision. Common services in Vietnam include information investigation, address finding, surveillance, phone number tracking, information verification, missing person searches, DNA testing, and counterfeit goods investigation. The cost of hiring a private investigator is around one million VND per day. For cases involving infidelity surveillance or searching for missing children, clients may pay tens of millions of VND per contract. Additionally, some internet service providers have shown signs of participating in this service. In general,
Vietnam Vietnam, officially the Socialist Republic of Vietnam (SRV), is a country at the eastern edge of mainland Southeast Asia, with an area of about and a population of over 100 million, making it the world's List of countries and depende ...
needs a clear legal framework for the private detective profession. In reality, many private detectives operate illegally, leading to calls for proper regulation of this profession.


Fiction

The PI genre in fiction dates to
Edgar Allan Poe Edgar Allan Poe (; January 19, 1809 – October 7, 1849) was an American writer, poet, editor, and literary critic who is best known for his poetry and short stories, particularly his tales involving mystery and the macabre. He is widely re ...
, who created the character C. Auguste Dupin in the 1840s. Dupin, an amateur crime-solver residing in Paris, appeared in three Poe stories. In addition,
Sherlock Holmes Sherlock Holmes () is a Detective fiction, fictional detective created by British author Arthur Conan Doyle. Referring to himself as a "Private investigator, consulting detective" in his stories, Holmes is known for his proficiency with obser ...
, created by
Arthur Conan Doyle Sir Arthur Ignatius Conan Doyle (22 May 1859 – 7 July 1930) was a British writer and physician. He created the character Sherlock Holmes in 1887 for ''A Study in Scarlet'', the first of four novels and fifty-six short stories about Hol ...
in the late 1880s, is arguably the most prominent private investigator in fiction.


Notable private investigators


In reality

* Jay J. Armes * Edwin Atherton * P. Balasubramaniam * Guy Banister * Rick Crouch * David Fechheimer * Charles Frederick Field * Dashiell Hammett (also a notable author of detective fiction) * Paul Henderson * Justin Hopson * James McParland * Gordon Novel * Jack Palladino * Rajani Pandit * Anthony Pellicano * Allan Pinkerton * Josiah "Tink" Thompson * Eugène François Vidocq * Kate Warne * David P. Weber


In fiction


Americas

* Banacek * Encyclopedia Brown * Frank Cannon * Richard Castle * Nick and Nora Charles * Richard Diamond * Johnny Dollar * Frankie Drake * Paul Drake * Nancy Drew * Mike Ehrmantraut *
Peter Gunn ''Peter Gunn'' is an American detective fiction, private eye television series, starring Craig Stevens (actor), Craig Stevens as Peter Gunn with Lola Albright as his girlfriend, lounge singer Edie Hart. The series was broadcast by NBC from Sept ...
* Mike Hammer * The Hardy Boys * Barnaby Jones * Jessica Jones * Rip Kirby * Thomas Magnum * Joe Mannix * Philip Marlowe *
Veronica Mars ''Veronica Mars'' is an American teen neo-noir Mystery fiction, mystery Drama (film and television), drama television series created by screenwriter Rob Thomas (writer), Rob Thomas. The series is set in the fictional city, fictional town of Ne ...
*
Adrian Monk Adrian Monk, portrayed by Tony Shalhoub, is the title character and protagonist of the USA Network television series ''Monk (TV series), Monk''. He is a renowned former homicide detective for the San Francisco Police Department. He has obsessive ...
* Nate the Great * Ezekiel "Easy" Rawlins * Jack Reacher * Jim Rockford * Sam & Max * John Shaft *
Simon & Simon ''Simon & Simon'' is an American crime drama television series that originally ran from November 24, 1981, to September 16, 1989. The series was broadcast on CBS, and starred Gerald McRaney and Jameson Parker as two disparate brothers who ope ...
* Sam Spade * Shawn Spencer * David Spenser * Three Investigators * Ms. Tree * Nick Valentine * Eddie Valiant * V. I. Warshawski * Honey West * Nero Wolfe


Asia

* Arjun * Byomkesh Bakshi * Goenda Baradacharan * Parashor Barma * Detective Conan * Ekenbabu *
Feluda Feluda is a fictional detective, private investigator created by Indian director and writer Satyajit Ray. Feluda resides at 21 Rajani Sen Road, Ballygunge, Calcutta, West Bengal, India. Feluda first made his appearance in a Bengali childre ...
* Hajime Kindaichi * L * Jayanta-Manik * Mitin Masi * Bhaduri Moshai * Kiriti Roy * Niladri Sarkar * Takayuki Yagami


Europe

* Basil of Baker Street * Nestor Burma * Albert Campion * Auguste Dupin * Marcus Didius Falco * Erast Fandorin *
Sherlock Holmes Sherlock Holmes () is a Detective fiction, fictional detective created by British author Arthur Conan Doyle. Referring to himself as a "Private investigator, consulting detective" in his stories, Holmes is known for his proficiency with obser ...
* Frank Marker * Hercule Poirot * Mma Precious Ramotswe * The Secret Seven * Cormoran Strike * Hetty Wainthropp * Varg Veum


See also

* Bounty hunter * Detective ** Hotel detective ** Store detective * Insurance investigator * Investigative journalism *
Mercenary A mercenary is a private individual who joins an armed conflict for personal profit, is otherwise an outsider to the conflict, and is not a member of any other official military. Mercenaries fight for money or other forms of payment rather t ...
** Private Military Companies *
Mystery film A mystery film is a film that revolves around the solution of a problem or a crime. It focuses on the efforts of the detective, private investigator or amateur Detective, sleuth to solve the mysterious circumstances of an issue by means of clues, ...
* Numerical analysis software : i.e. SAS, Palantir Technologies Gotham * Private police ** Company police * World Association of Detectives


References


External links


Bureau of Labor Statistics information
{{DEFAULTSORT:Private Investigator Criminal investigation Law enforcement occupations