Mich. Comp. Laws § 338.3657

Sec. 57. (1) A licensed physician shall attend each contest. The physician shall observe the physical condition of the contestants and advise the referee or judges with regard to the health of those contestants. The physician shall examine each contestant before he or she enters the ring. (2) The physician described in subsection (1) shall file with the commission the report of the physical examination of each contestant within 24 hours after the contest or event ends. (3) If, in the opinion of a physician described in subsection (1), the health or safety of a contestant requires the termination of the contest in which he or she is competing, the physician shall notify the referee and the referee shall terminate the contest.