Any witness who refuses to be sworn, or who refuses to appear or testify, or who disobeys any lawful order of the Fire Marshal or who fails or refuses to produce any document touching any matter under examination, or who is guilty of any contemptuous conduct during any of the proceedings of the Fire Marshal in the matter of such investigation or inquiry, after being summoned to give testimony in relation to any matter under investigation, shall be deemed guilty of a misdemeanor. It shall be the duty of the Fire Marshal to cause all such offenders to be prosecuted.