Under the M'Naghten test a defendant may be found not guilty by reason of insanity if it can be shown that, as a result of defect of reason from disease of the mind the defendant (1) did not know the nature and quality of the act committed or (2):

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Under the M'Naghten test, a defendant is not guilty by reason of insanity if they did not know the nature and quality of the act or did not know that the act was wrong due to a mental disease or defect.

Under the M'Naghten Test a Defendant May Be Found Not