Maryland Code, Commercial Law § 13-104

(1) The professional services of a certified public accountant, architect, clergyman, professional engineer, lawyer, veterinarian, insurance company authorized to do business in the State, insurance producer licensed by the State, Christian Science practitioner, land surveyor, property line surveyor, chiropractor, optometrist, physical therapist, podiatrist, real estate broker, associate real estate broker, or real estate salesperson, or medical or dental practitioner;

(2) A public service company, to the extent that the company's services and operations are regulated by the Public Service Commission;  or

(3) A television or radio broadcasting station or a publisher or printer of a newspaper, magazine, or other form of printed advertising who broadcasts, publishes, or prints an advertisement which violates this title, unless the station, publisher, or printer engages in an unfair or deceptive trade practice in the sale of its own goods or services or has knowledge that the advertising is in violation of this title.