In connection with any audit and examination conducted under the provisions of this act, the state treasurer, or a deputy state treasurer, may issue subpoenas, direct the service thereof by any police officer, and compel the attendance and testimony of witnesses, may administer oaths and examine such persons as may be necessary, and may compel the production of books and papers. The orders and subpoenas issued by the state treasurer or by a deputy state treasurer, in pursuance of the authority in them vested by provisions of this section, may be enforced upon their application to any circuit court by proceedings in contempt therein, as provided by law.