The M'Naghten rule lists several components to meet the standard of legal insanity. One of the components is that, at the moment of the crime, the accused must have:

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The M'Naghten rule states that for a defendant to be considered legally insane, they must have been laboring under a defect of reason from a disease of the mind at the time of the crime, to the extent that they did not know the nature and quality of the act they were doing, or if they did know it, that they did not know what they were doing was wrong.

The M'Naghten Rule Lists Several Components to Meet the Standard