California, United States of America
The following excerpt is from McGuire v. Superior Court For Los Angeles County, 274 Cal.App.2d 583, 79 Cal.Rptr. 155 (Cal. App. 1969):
Diminished capacity is an 'affirmative defense' as this concept is used in Jones, since evidence of diminished capacity goes to the capacity of a defendant to achieve a mental state which is a necessary element of the corpus delicti of a particular crime (People v. Anderson, Supra).
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