who must determine whether a defendant was insane at the time of a crime
Insanity defense The defense is based on evaluations by forensic mental health professionals with the appropriate test according to the jurisdiction. Their testimony guides the jury, but they are not allowed to testify to the accused's criminal responsibility, as this is a matter for the jury to decide. Similarly, mental health practitioners are restrained from making a judgment on the issue of whether the defendant is or is not insane or what is known as the "ultimate issue".[8]
Juries in the United States A petit jury, also known as a trial jury, is the standard type of jury used in criminal cases in the United States. Petit juries are responsible for deciding whether or not a defendant is guilty of violating the law in a specific case. They consist of 6-12 people and their deliberations are private. Their decision is known as a verdict and decides whether a person is guilty or not guilty.[3]