Haw. Rev. Stat. § 841-6: Subpoenas; penalty for failure to comply.

[(a)] The coroner or any deputy coroner may issue subpoenas for the attendance of any witnesses that the coroner or any deputy coroner may deem necessary to interrogate in the death then under investigation, returnable forthwith or at such place and time as the coroner or any deputy coroner shall therein direct.

[(b)] Any person who fails to comply with the requirements of such a subpoena upon conviction before any district court having jurisdiction in the matter, shall be fined not more than $25.