In most states, if a psychiatrist testifies as an expert in a case where the defendant entered a plea of Not Guilty by Reason of Insanity, he/she may give:

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A psychiatrist may not give a professional opinion as to whether the defendant is legally insane, as this is a decision for the judge or jury to make. However, they may offer their expert opinion on how mental illness likely affected the defendant's behavior, which could be relevant in determining whether the defendant meets the legal criteria for insanity. They may not give personal opinions on the defendant's responsibility, as this is also a legal decision.

In Most States, If a Psychiatrist Testifies as an Expert