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Under CA law,
A defendant is considered mentally incompetent, and thus unable to stand trial, if either of the following is true: 1) they are unable to understand the nature of the criminal proceedings (i.e., what is going on in the trial and why), OR 2) they are unable to assist their lawyer in a rational manner. See: Penal Code 1367(a) PC.
Thus, in order for a personality disorder to be considered a sufficient mental defect it must meet one of those two criteria.
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