Under the Influence

Defendants who commit crimes under the influence of drugs or alcohol sometimes argue that their mental functioning was so impaired that they cannot be held accountable for their actions. Generally, however, voluntary intoxication does not excuse criminal conduct. Defendants know (or should know) that alcohol and drugs affect mental functioning, and thus they should be held legally responsible if they commit crimes as a result of their voluntary use.

Some states allow an exception to this general rule. If the defendant is accused of committing a crime that requires "specific intent" (intending the precise consequences, as well as intending to do the physical act that leads up to the consequences), the defendant can argue that he was too drunk or high to have formed that intent. This is only a partial defense, however, because it doesn't entirely excuse the defendant's actions. In this situation, the defendant will usually be convicted of another crime that doesn't require proof of a specific intent. For example, a defendant may be prosecuted for the crime of assault with specific intent to kill but only convicted of assault with a deadly weapon, which doesn't require specific intent.

Entrapment

Entrapment occurs when the government induces a person to commit a crime and then tries to punish the person for committing it. However, if a judge or jury believes that a suspect was predisposed to commit the crime anyway, the suspect may be found guilty even if a government agent suggested the crime and helped the defendant to commit it. Entrapment defenses are therefore especially difficult for defendants with prior convictions for the same type of crime.

To learn more about criminal defenses and all other aspects of a criminal trial, get The Criminal Law Handbook: Know Your Rights, Survive the System, by Paul Bergman and Sara J. Berman-Barrett (Nolo).