Maryland Code, Health Occupations § 2-102

(1) Limit the right of an individual to practice a health occupation that the individual is authorized to practice under this article;

(2) Prohibit an individual from practicing any other profession that the individual is authorized to practice under the laws of this State;

(3) Limit the right of a physician who is authorized to practice medicine under the laws of the State to treat the human ear or fit hearing aids; or

(4) Apply to the servicing, marketing, sale, dispensing, use, customer support, or distribution of over-the-counter hearing aids through in-person transactions, by mail, or online as authorized by federal law and regulations.