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The American Law Institute (ALI) rule, also known as the ALI test or the Model Penal Code (MPC) test, is a colloquial term for formulation of a test for legal insanity for use in criminal cases in which a defendant alleges that he or she should not be held criminally responsible for a crime because of his or her mental state at the time of the offense.

American Law Institute and the Model Penal Code

Established in 1923, the ALI is an organization of legal academics, judges, and lawyers from a diverse range of practice areas. The goals of the ALI are to promote clarification and simplification of U.S. common law by drafting and publishing comprehensive summaries of the law (Restatements), recommended changes in the law (Principles), ...

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