Section 29 Of Title 1. Of Persons Liable To Punishment For Crime From California Penal Code >> Title 1. >> Part 1.
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. In the guilt phase of a criminal action, any expert testifying
about a defendant's mental illness, mental disorder, or mental defect
shall not testify as to whether the defendant had or did not have
the required mental states, which include, but are not limited to,
purpose, intent, knowledge, or malice aforethought, for the crimes
charged. The question as to whether the defendant had or did not have
the required mental states shall be decided by the trier of fact.