Haw. Code R. § 12-41-15
A party may make written application for subpoenas requiring the attendance and testimony of witnesses and production of any evidence, including books, records, correspondence, or documents , in their possession or under their control. An application for a subpoena requiring the production of evidence shall not be granted unless the evidence is described with sufficient particularity to enable it to be identified by the producer. An application for a subpoena whether ad testificandum or duces tecum prior to a hearing shall be made to the board. An application during a hearing shall be made orally to the person conducting the hearing. Application for subpoenas may be made ex parte. Upon application, the board or the person to whom the application is made shall forthwith issue the subpoena.
Haw. Code R. § 12-41-15