California Code, Business and Professions Code - BPC § 18705

Every promoter shall have at its own expense in attendance at every contest, a licensed physician approved by the commission who has had not less than three years experience in the practice of medicine since licensure, who shall perform the physical examination of the contestants and observe the physical condition of the contestants during the contest or match.

The services of the physician shall be paid according to a schedule of fees adopted by the commission. The fees shall be paid by the club to the commission, and it shall remit the payment to the physician.