Md. Code, Business Regulation § 4–302

(a) Except as provided in subsection (b) of this section, this subtitle does not apply to:

(1) intercollegiate, interscholastic, or intramural boxing, kick boxing, or wrestling;

(2) amateur boxing conducted under the supervision of a nationally recognized amateur organization;

(3) martial arts where:

(i) contact to the body is permitted in only a restrained manner;

(ii) contact to the head is not permitted; and

(iii) no contact is permitted that may result, or is intended to result, in physical harm to an opponent; or

(4) a mixed martial arts exhibition.

(b) Each boxer shall wear protective headgear in each amateur boxing match or exhibition.