Idaho Rules of Evidence Rule 404. Character Evidence; Crimes or Other Acts.

(a)  Character Evidence.

(1)  Prohibited Uses.  Evidence of a person's character or trait of character is not admissible to prove that on a particular occasion the person acted in accordance with the character or trait.

(2)  Exceptions for a Defendant or Victim in a Criminal Case.  The following exceptions apply in a criminal case:

(A) a defendant may offer evidence of the defendant’s pertinent trait, and if the evidence is admitted, the prosecutor may offer evidence to rebut it;

(B) a defendant may offer evidence of an alleged victim’s pertinent trait of character, and if the evidence is admitted, the prosecutor may offer evidence to rebut it;

(C) in a homicide case, the prosecutor may offer evidence of the alleged victim’s trait of peacefulness to rebut evidence that the victim was the first aggressor.

(3)  Exceptions for a Witness. Evidence of a witness’s character may be admitted under Rules 607, 608 and 609.

(b)  Crimes, Wrongs, or Other Acts.

(1) Prohibited Uses.  Evidence of a crime, wrong, or other act is not admissible to prove a person’s character in order to show that on a particular occasion the person acted in accordance with the character.

(2) Permitted Uses; Notice in a Criminal Case.  This evidence may be admissible for another purpose, such as proving motive, opportunity, intent, preparation, plan, knowledge, identity, absence of mistake, or lack of accident.  In a criminal case, the prosecutor must:

(A) file and serve reasonable notice of the general nature of any such evidence that the prosecutor intends to offer at trial; and

(B) do so reasonably in advance of trial – or during trial if the court, for good cause shown, excuses lack of pretrial notice.

(Adopted March 26, 2018, effective July 1, 2018.)