HRS §469-7
Health department can subpoena witnesses for hearings
The health department can require witnesses to come and testify under oath at its hearings. If a witness does not cooperate, the circuit court can step in to make them appear and testify.
courtsstate agencies
The statute, as written — Powers of department to subpoena witnesses, etc
The department of health may subpoena and examine witnesses under oath upon all such charges as may be preferred before it, and the circuit court of the circuit in which the hearing is held shall enforce by proper proceedings the attendance and testimony of witnesses so subpoenaed.
LawTrove is not legal advice. The summary above is a computer-generated restatement — the authoritative text is the official version linked above.