Hawaii Revised Statutes Division 2. Business § 487-9

The director in the course of the director's investigations may subpoena witnesses, examine them under oath, and require the production of books, papers, documents, or objects which the director deems relevant to the investigation. Service of the subpoena may be made personally within this State, but if personal service cannot be obtained, substituted service may be made on any witness over whom the courts can exercise jurisdiction pursuant to chapter 634, in the following manner:

Upon application by the director, obedience to the subpoena may be enforced by the circuit courts of this State in the county where the person subpoenaed resides or is found in the same manner as a subpoena issued by the clerk of a circuit court. If the person is a nonresident or has no principal place of business within this State, obedience to the subpoena may also be enforced by a circuit court of this State in the county where the subpoena was issued. The director may conduct hearings in aid of any investigation or inquiry, and may prescribe forms and adopt rules as may be necessary in the interest of the consumer public.