How Defendants' Mental States Affect Their Responsibility for a Crime
Criminal intent -- also called "mens rea" -- is an element of some, but not all, crimes.
What makes a crime a crime? In most cases, an act is a crime because the person committing it intended to do something that the state legislature or Congress has determined is wrong, also known as criminal intent. This mental state is generally referred to as "mens rea," Latin for "guilty mind."
The "mens rea" concept is based on a belief that people should be punished only when they have acted in a way that makes them morally blameworthy. In the legal system's eyes, people who intentionally engage in the behavior prohibited by a law are morally blameworthy.
Careless Behavior
"Ordinary" carelessness is not a crime. For example, careless ("negligent") drivers are not usually criminally prosecuted if they cause an accident, though they may have to pay civil damages to those harmed by their negligence.
However, more-than-ordinary carelessness ("recklessness" or "criminal negligence") can amount to mens rea. In general, carelessness can be a crime when a person "recklessly disregards a substantial and unjustifiable risk." It's up to judges and juries to evaluate a person's conduct according to community standards and decide whether the carelessness is serious enough to demonstrate mens rea.
Unintentional vs. Intentional Conduct
People who unintentionally engage in illegal conduct may be morally innocent; this is known as making a "mistake of fact." Someone who breaks the law because he or she honestly misperceives reality lacks mens rea and should not be charged with or convicted of a crime. For example, if Paul Smith hits Jonas Sack because he reasonably but mistakenly thought Sack was about to hit him, Smith would not have mens rea.
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