According to this rule, a defendant is insane when it can be shown that he or she was so delusional at the time of the offense that he or she did not know right from wrong.

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The M'Naghten rule states that a defendant is considered legally insane if, at the time of the offense, they were suffering from such a defect of reason, from a 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.

According to This Rule, a Defendant Is Insane When It