Legal Definition of M'Naghten test
— called also M'Naghten rule— compare diminished capacity, durham rule, irresistible impulse test, substantial capacity test
Note: Many jurisdictions have followed the Model Penal Code in basing criminal insanity on either of two factors: an inability to appreciate the wrongfulness of an act, which reflects the influence of the M'Naghten test, or an inability to conform one's behavior to the dictates of the law, which reflects the concept of the irresistible impulse. Both factors must be rooted in a mental disease or defect, which is also what the Durham rule requires of insanity.
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