For the purpose of enforcing the provisions of this chapter, the board may:
No person shall be excused from attending and testifying or from producing documentary evidence before the board in obedience to a subpoena of the board on the ground or for the reason that the testimony or 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 person shall be prosecuted or subjected to any penalty or forfeiture for or on account of any transaction, matter, or thing concerning which the person is compelled, after having claimed the person's privilege of self-incrimination, to testify, or produce evidence, documentary or otherwise, before the board in obedience to a subpoena issued by the board; provided that no person so testifying shall be exempt from prosecution for perjury committed in so testifying.
Witnesses summoned before the board shall be paid the same fees and mileage that are paid witnesses in the circuit courts of this State, and witnesses whose depositions are taken and the persons taking them shall severally be entitled to the same fees as are paid for like services in the courts.
HRS § 161-8