Although the standard of insanity known as the M'Naghten standard became the accepted rule in England,in the United States and Canada it could not be labelled as a true cognitive test of insanity.

Question

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The M'Naghten standard is indeed considered a cognitive test of insanity in both the United States and Canada, focusing on the defendant's ability to understand the nature of the act or distinguish right from wrong.

Although the Standard of Insanity Known as the M'Naghten Standard