Hawaii Revised Statutes Division 4. Courts and Judicial Proceedings § 626-1, Rule 608

(a) Opinion and reputation evidence of character. The credibility of a witness may be attacked or supported by evidence in the form of opinion or reputation, but subject to these limitations:

(b) Specific instances of conduct. Specific instances of the conduct of a witness, for the purpose of attacking the witness' credibility, if probative of untruthfulness, may be inquired into on cross-examination of the witness and, in the discretion of the court, may be proved by extrinsic evidence. When a witness testifies to the character of another witness under subsection (a), relevant specific instances of the other witness' conduct may be inquired into on cross-examination but may not be proved by extrinsic evidence.

The giving of testimony, whether by an accused or by any other witness, does not operate as a waiver of the witness' privilege against self-incrimination when examined with respect to matters which relate only to credibility.