You overhear several people discussing the relative merits of the M'Naghten rule. What are they talking about?

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The M'Naghten rule is a legal test for the insanity defense in criminal cases. It originated from a case in England in 1843, and it sets forth the standard that a defendant cannot be held criminally responsible for their actions if, at the time of the offense, they were operating under a mental defect or disease that prevented them from knowing the nature and quality of their actions or that what they were doing was wrong. This rule is still used in some form in many common law jurisdictions, including the U.S.

You Overhear Several People Discussing the Relative Merits of the M'Naghten