Mass. Gen. Laws ch. 147 § 39A
No professional boxer, kickboxer, mixed martial arts contestant or other unarmed combative sport contestant licensed under section 35 who has been knocked out, technically or otherwise, or lost a contest by way of submission, 6 or more times in the preceding 12 months shall take part in a match or exhibition until he has been examined and found fit to take part in such a match or exhibition, by a physician selected by the commission, at a place and time designated by the commission. The cost of conducting the examination shall be borne by the contestant. If a contestant is found unfit to engage in a match or exhibition, he shall be excluded from participation for 3 months, after which time he may make a request to the commission for another physical examination. A license issued to an individual under section 35 shall be immediately suspended for at least 30 days if the individual is knocked out.
Mass. Gen. Laws ch. 147, § 39A