Md. Code, Health Occupations § 2–314.5

While practicing audiology or hearing aid dispensing, an audiologist or a hearing aid dispenser may not directly or indirectly give or offer to give anything of value to another person who provides professional services to clients, if the thing of value is given to induce the person receiving the thing of value to:

(1) Buy a product or service from the person giving the thing of value;

(2) Refrain from buying a product or service of a competitor of the person giving the thing of value; or

(3) Influence another to:

(i) Buy a product or service from the person giving the thing of value; or

(ii) Refrain from buying a product or service of a competitor of the person giving the thing of value.