California, United States of America
The following excerpt is from People v. Lopez, F065052 (Cal. App. 2014):
In other words, the defense of legal insanity can never be proven, as a matter of law, when the only mental disease or defect is a personality disorder. (People v. Cabonce (2009) 169 Cal.App.4th 1421, 1436.)
The jury was instructed on this concept in part of CALCRIM No. 3450 as follows:
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