(a) As to the subject of any examination, investigation, or hearing being conducted by him, the commissioner may subpoena witnesses and administer oaths or affirmations and examine any individual under oath or take depositions and, by subpoena duces tecum, may require and compel the production of records, books, files, documents, and other evidence.

(b) Witness fees and mileage, if claimed, shall be allowed the same as for testimony in a circuit court. Witness fees, mileage, and the actual expense necessarily incurred in securing attendance of witnesses and their testimony shall be itemized and shall be paid by the person being examined if in the proceedings in which such witness is called such person is found to have been in violation of the law or by the person, if other than the commissioner, at whose request the hearing is held.

(c) Subpoenas of witnesses shall be served in the same manner and at the same cost as if issued by a circuit court. If any individual fails to obey a subpoena issued and served under this section with respect to any matter concerning which he may be lawfully interrogated or required to produce for examination, on application of the commissioner, the circuit court of the county in which is pending the proceeding at which such individual was so required to appear or the circuit court of the county in which such individual resides may issue an order requiring such individual to comply with the subpoena and to testify or produce the evidence subpoenaed. Any failure to obey such order of the court may be punished by the court as a contempt thereof.

(d) Any person willfully testifying falsely under oath as to any matter material to any such examination, investigation, or hearing shall, upon conviction thereof, be guilty of perjury and punished accordingly.