The purpose of this comment is two-fold: first, to discuss generally the criminal law concept of mental disease or defect; and second, to provide an analysis of important Missouri case law arising under the 1963 mental responsibility act. Prior to the passage of the act, Missouri followed the traditional test for criminal insanity known as the M'Naghten Rule. The new codification includes some of the various modifications of the M'Naghten Rule that have been made in both the recent and more distant past. In order to better understand the application of the Missouri statute, a discussion of the various approaches for determining "insanity" will be helpful.

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