Mich. Comp. Laws § 408.337

Sec. 17. The department, with the advice and consent of the board, shall employ or retain a person qualified in engineering and training who shall be designated chief inspector. The chief inspector and such additional inspectors and other employees as may be necessary to properly administer this act may be hired on a temporary basis or borrowed from other state departments, or the department may contract with persons, partnerships or corporations for such inspection services on an independent basis.