Hawaii Revised Statutes Division 4. Courts and Judicial Proceedings § 626-1, Rule 404

(a) Character evidence generally. Evidence of a person's character or a trait of a person's character is not admissible for the purpose of proving action in conformity therewith on a particular occasion, except:

(b) Other crimes, wrongs, or acts. Evidence of other crimes, wrongs, or acts is not admissible to prove the character of a person in order to show action in conformity therewith. It may, however, be admissible where such evidence is probative of another fact that is of consequence to the determination of the action, such as proof of motive, opportunity, intent, preparation, plan, knowledge, identity, modus operandi, or absence of mistake or accident. In criminal cases, the proponent of evidence to be offered under this subsection shall provide reasonable notice in advance of trial, or during trial if the court excuses pretrial notice on good cause shown, of the date, location, and general nature of any such evidence it intends to introduce at trial.