According to this rule, a person is not guilty of a crime, if at the time of the crime, he or she had a mental defect or disability that resulted in the person not knowing what he or she was doing was wrong.

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This rule is commonly known as the M'Naghten Rule and is used as a defense for criminal responsibility in many common law jurisdictions. It states that a person is not guilty if they did not know the nature and quality of their actions or did not understand that what they were doing was wrong due to a mental defect or disability.

According to This Rule, a Person Is Not Guilty of a Crime