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2013•The Encyclopedia of Criminology and Criminal JusticeRequires access

Insanity Defense

Kristin Santos

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Abstract

Abstract An affirmative defense to criminal liability is the finding of not guilty by reason of insanity (NGRI). In the case of NGRI, a defendant participated in the crime of which they are accused and therefore met the actus reus, but because they did not meet the mens rea element due to their mental status, they cannot be held criminally responsible. There are four types of mental abnormality that can be considered, from a legal perspective, as acceptable for the insanity defense. These types, their history, and outcomes are explained in this entry.

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Abstract An affirmative defense to criminal liability is the finding of not guilty by reason of insanity (NGRI). In the case of NGRI, a defendant participated in the crime of which they are accused and therefore met the actus reus, but because they did not meet the mens rea element due to their mental status, they cannot be held criminally responsible. There are four types of mental abnormality that can be considered, from a legal perspective, as acceptable for the insanity defense. These types, their history, and outcomes are explained in this entry.

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Available abstract

Abstract An affirmative defense to criminal liability is the finding of not guilty by reason of insanity (NGRI). In the case of NGRI, a defendant participated in the crime of which they are accused and therefore met the actus reus, but because they did not meet the mens rea element due to their mental status, they cannot be held criminally responsible. There are four types of mental abnormality that can be considered, from a legal perspective, as acceptable for the insanity defense. These types, their history, and outcomes are explained in this entry.

Key concepts: Insanity defense, Mens rea, Insanity, Criminal liability, Perspective (graphical), Psychology, Criminology, Liability

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