In criminal law, intent is one of three general classes of mens rea necessary to constitute a conventional, as opposed to strict liability, crime. A more formal, generally synonymous legal term is scienter: intent or knowledge of wrongdoing.
Intent is defined in Canadian law by the ruling in R v Mohan (1994) as "the decision to bring about a prohibited consequence."
A range of words represents shades of intent in criminal laws around the world. The mental element, or mens rea, of murder, for example, is traditionally expressed as malice aforethought, and the interpretations of malice, "maliciously" and "willful" vary between pure intent and recklessness or negligence, depending on the jurisdiction in which the crime was committed and the seriousness of the offence. The intent element of a crime, such as intent to kill, may exist without a malicious motive, or even with a benevolent motive, such as in the case of euthanasia.
A person intends a consequence when they 1) foresee that it will happen if their given series of acts or omissions continue, and 2) desire it to happen. The most serious level of culpability, justifying the most serious levels of punishment, is achieved when both these components are actually present in the accused's mind (a "subjective" test). A person who plans and executes a crime is considered, rightly or wrongly, a more serious danger to the public than one who acts spontaneously (perhaps because they are less likely to get caught), whether out of the sudden opportunity to steal, or out of anger to injure another. But intent can also come from the common law viewpoint as well.
The policy issue for those who administer the criminal justice system is that, when planning their actions, people may be aware of many probable and possible consequences. Obviously, all of these consequences could be prevented through the simple expedient either of ceasing the given activity or of taking action rather than refraining from action. So the decision to continue with the current plan means that all the foreseen consequences are to some extent intentional, i.e. within and not against the scope of each person's intent. But, is the test of culpability based on purely a subjective measure of what is in a person's mind, or does a court measure the degree of fault by using objective tools?
For example, suppose that A, a jealous wife, discovers that her husband is having a sexual affair with B. Wishing only to drive B away from the neighbourhood, she goes to B's house one night, pours petrol on and sets fire to the front door. B dies in the resulting fire. A is shocked and horrified. It did not occur to her that B might be physically in danger and there was no conscious plan in her mind to injure B when the fire began. But when A's behaviour is analysed, B's death must be intentional. If A had genuinely wished to avoid any possibility of injury to B, she would not have started the fire. Or, if verbally warning B to leave was not an option, she should have waited until B was seen to leave the house before starting the fire. As it was, she waited until night when it was more likely that B would be at home and there would be fewer people around to raise the alarm. Whereas intent would be less if A had set fire to the house during the day after ringing the doorbell to check no one was home and then immediately ringing the fire brigade to report the fire.
On a purely subjective basis, A intended to render B's house uninhabitable, so a reasonably substantial fire was required. The reasonable person would have foreseen a probability that people would be exposed to the risk of injury. Anyone in the house, neighbours, people passing by, and members of the fire service would all be in danger. The court therefore assesses the degree of probability that B or any other person might be in the house at that time of the night. The more certain the reasonable person would have been, the more justifiable it is to impute sufficient desire to convert what would otherwise only have been recklessness into intent to constitute the offence of murder. But if the degree of probability is lower, the court finds only recklessness proved. Some states once had a rule that a death that occurred during commission of a felony automatically imputed sufficient mens rea for murder. (See felony murder). This rule has been mostly abolished, and direct evidence of the required mental components is now required. Thus, the courts of most states use a hybrid test of intent, combining both subjective and objective elements, for each offence changed.
In English law, s8 Criminal Justice Act 1967 provides the frame of which the 'mens rea' is assessed. It states:
Under s8(b) therefore, the jury is allowed a wide latitude in applying a hybrid test to impute intent or foresight (for the purposes of recklessness) on the basis of all the evidence. See Intention in English law.
The 9 Panel Justices Held in United States of America vs Elonis (on Certiorari 2015),(Certiorari appeal denied 2017), that Negligence/Recklessness is not sufficient for a conviction of speech. There must be a culpable mental state and being accepting of the mens rea to hold a conviction.
In some states, a distinction is made between an offense of basic (sometimes termed "general") intent and an offense of specific intent.
At times a forensic psychiatric examination may be helpful in ascertaining the presence or absence of mens rea in crimes which require specific intent.
Direct intent: a person has direct intent when they intend a particular consequence of their act.
Oblique intent: a person has oblique intent when the event is a natural consequence of a voluntary act and they foresee it as such. The 'natural consequence' definition was replaced in R v Woollin with the 'virtually certain' test. A person is now held to intend a consequence (obliquely) when that consequence is a virtually certain consequence of their action, and they knew it to be a virtually certain consequence. The first leg of this test has been condemned as unnecessary: a person should be held as intending a consequence if (s)he believed it to be a virtually certain consequence, regardless of whether it was in fact virtually certain.
This has two applications:
Unconditional Intent: a person’s expected result from the consequence of their actions.
Conditional Intent: a person’s expected result only when a condition diverts the person from their unconditional intent.
For example, a couple is planning to have an outdoor wedding, but they also reserved an indoor facility in the unlikely condition of bad weather. The unconditional intent is to have the wedding outside. The conditional intent is to have the wedding inside on the condition of bad weather.
In Holloway v. United States, the United States Supreme Court held that the word ‘intent’ within a federal statute could mean either a person’s “unconditional intent”, “conditional intent” or both depending on context and the congressional purpose of the statute.
Holloway was charged and convicted with the federal crime of Carjacking “with the intent to cause death or serious bodily harm". Holloway admitted to carjacking at gunpoint but argued he only intended to use his weapon “if any of the drivers had given him a hard time". The unconditional intent was to carjack without harm to the driver. The conditional intent was to carjack and cause harm to the driver if the driver became uncooperative.
The issue of this case was whether the statute's phrase, "with the intent to cause death or serious bodily harm" applies to a defendant’s unconditional intent or conditional intent. The Court found that although the construction of the phrase suggests that Congress meant to provide “a federal penalty for only those carjackings in which the offender actually attempted to harm or kill the driver…that a commonsense reading of the carjacking statute counsels that Congress intended to criminalize a broader scope of conduct than attempts to assault or kill in the course of automobile robberies”. The Court, therefore, affirmed Holloway’s conviction and held that a defendant’s conditional intent may violate a federal crime depending on the context and purpose of the statute.
In many situations in the United States, a person is considered to have acted with intent if the definitions of purpose and/or knowledge are satisfied. In other situations (especially regarding specific intent crimes that have "with intent to" in their definition), intent may be considered to refer to purpose only. Quite arguably, the most influential legal definitions of purpose and knowledge come from the Model Penal Code's definitions of mens rea.