Rule 12.2 - Notice of insanity defense or expert testimony of defendant's mental condition(a) Defense of insanity. - If a defendant intends to rely upon the defense of insanity at the time of the alleged offense, 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 general in writing of such intention and file a copy of such notice with the prothonotary. If there is a failure to comply with the requirements of this subdivision, insanity may not be raised as a defense. The court may for cause shown allow late filing of the notice or grant additional time to the parties to prepare for trial or make such other order as may be appropriate.(b) Expert testimony of defendant's mental condition. - If a defendant intends to introduce expert testimony relating to a mental illness, defect, psychiatric disorder or any other mental or emotional 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 general in writing of such intention and file a copy of such notice with the prothonotary. The court may for cause shown allow late filing of the notice or grant additional time to the parties to prepare for trial or make such other order as may be appropriate.(c) Mental examination of defendant. - In an appropriate case the court may, upon motion of the attorney general, order the defendant to submit to an examination. No statement made by the defendant in the course of any examination provided for by this rule, whether the examination be with or without the consent of the defendant, no testimony by the expert based upon such statement, and no other fruits of the statement shall be admitted in evidence against the defendant in any criminal proceeding except on an issue respecting mental or emotional condition on which the defendant has introduced testimony.(d) Failure to comply. If there is a failure to give notice when required by subdivision (b) of this rule or to submit to an examination when ordered under subdivision (c) of this rule, the court may exclude the testimony of any expert witness offered by the defendant on the issue of the defendant's guilt.(e) Inadmissibility of withdrawn intention. - Evidence of an intention as to which notice was given under subdivision (a) or (b) , later withdrawn, is not, in any civil or criminal proceeding, admissible against the person who gave notice of the intention.De. R. Crim. P. Super. Ct. 12.2