The insanity defense is different from mental competence to stand trial. The insanity defense pertains to the defendant’s mental state when he or she commits the crime. If the insanity defense is successful, it exonerates the defendant from guilt. Mental competence to stand trial is analyzed at the time the trial is to take place. If the defendant is mentally incompetent to stand trial, the trial is delayed until the defendant regains competency. Although a detailed discussion of mental competence to stand trial is beyond the scope of this book, in general, a criminal defendant must be able to understand the charges against him or her, and be able to assist in his or her defense. As the Model Penal Code provides, “[n]o person who as a result of mental disease or defect lacks capacity to understand the proceedings against him or to assist in his own defense shall be tried, convicted or sentenced for the commission of an offense so long as such incapacity endures” (Model Penal Code § 4.04). A defendant who is mentally incompetent at the time of trial is subject to mental health treatment or even involuntary medication until competence is regained.
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