Wyo. R. Crim. P. 12.2 (2026)

Rule 12.2. Defense of Mental Illness or Deficiency. (a) Plea. — If a defendant intends to rely upon the defense of mental illness or deficiency at the time of the alleged offense, the defendant shall enter a plea of not guilty by reason of mental illness or deficiency at arraignment. For good cause the court may permit the plea to be entered at a later time. If there is a failure to comply with the requirements of this subdivision, evidence of mental illness or deficiency may not be introduced. (b) Expert testimony of defendant’s mental condition. — If a defendant intends to introduce expert testimony relating to a mental illness or deficiency or any other mental condition of the defendant bearing upon the issue of guilt, the defendant shall, within the time provided for the filing of pretrial motions or at such later time as the court may direct, notify the attorney for the state in writing of such intention and file a copy of such notice with the clerk. The requirement of this subdivision is in addition to the disclosures required by