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Permission given by one person for another person to take an action that would normally be considered wrongful or illegal.

Implied Consent:
Consent inferred from the conduct of a person, rather than from a direct verbal expression.

For crimes like forcible rape, where lack of consent is an essential element of the crime, consent is, of course, an absolute defense. For all other crimes, consent of the victim is usually not a defense. There are exceptions, however, for certain (usually minor) assaults and batteries. In such cases, courts will recognize consent as a defense if: 1) the criminal act did not involve serious bodily injury or the threat of serious bodily injury, 2) there is widespread acceptance of the risk (as in a sporting event) and, 3) there is a beneficial result of the defendant’s conduct. The Model Penal Code adopts a similar approach.

Even where consent can be used as a defense, it will only be valid if the consent was legally effective. In order for the consent to be legally effective, three requirements must be met. First, the consent must have been given voluntarily. Second, the consent must have been given by a person legally capable of consenting. A minor or someone with a mental impairment or someone who is intoxicated at the time he or she gave the consent is not legally capable of consenting. Therefore, consent given by any of these people is not legally effective and cannot be used as the basis for a consent defense. Third, the consent cannot have been given as a result of fraud or mistake. Consent that is given as a result of fraud or mistake is legally ineffective.

Consent can be express or implied. However, the consent is only valid to the extent that the party giving the consent intended. If the consent is implied, the consent is only valid to the extent that a reasonable person would assume under the circumstances. For example:

EXAMPLE (1): Derek is a baseball player. During a game, while he is batting, Pedro, the pitcher, throws a baseball that hits Derek in the ribs. Derek wants Pedro prosecuted for Battery. Since Derek implied his consent to having inside pitches thrown to him by playing in the baseball game, Pedro will have a valid defense against any charge of battery.

EXAMPLE (2): Derek is a baseball player. Between innings, Pedro, the opposing pitcher, walks up to the dugout where Derek is sitting and fires a baseball at Derek's head. In this case, Pedro could be charged with Assault and/or battery. Derek's implied consent does not extend to situations in which he is simply sitting in the dugout in between innings. Therefore, Pedro can be charged with battery.