M'Naughten rule

This rule applied to the insanity defense grew out of an 1843 English murder case: "...at the time of the committing of the act, the party accused was labouring under such a defect of reason, from disease of the mind, as not to know the nature and quality of the act he was doing; or, if he did know it that he did not know he was doing what was wrong."

• forensic
• eponyms