Haw. Rev. Stat. § 383-100
No person shall be excused from attending or testifying or producing material, books, papers, correspondence, memoranda, and other records before the director of labor and industrial relations, any duly authorized representative of the director, the referee, or any substitute referee, or in obedience to the subpoena of any of them, in any cause or proceeding before them or any of them, on the grounds that the testimony and evidence, documentary or otherwise, required of the person may tend to incriminate the person or subject the person to a penalty or forfeiture; but no individual shall be prosecuted or subjected to any penalty or forfeiture for or on account of any transaction, matter, or thing concerning which the individual is compelled, after having claimed the individual's privilege against self-incrimination, to testify or produce evidence, documentary or otherwise, except that the individual so testifying shall not be exempt from prosecution and punishment for perjury committed in so testifying.
HRS § 383-100