Iowa Code § 100.7: Oaths — attendance of witnesses.

The fire marshal and the fire marshal’s designated subordinates shall each have power in any county in the state to administer an oath and compel the attendance of witnesses before them, or either of them, to testify in relation to any matter which is by the provisions of this chapter a subject of inquiry and investigation, and may require the production of any books, papers, or documents necessary for such investigation.