Md. Code, Health Occupations § 18–402

(a) Unless authorized to practice psychology under this title, a person may not represent to the public by title, by description of services, methods, or procedures, or otherwise, that the person is authorized to practice psychology in this State.

(b) Unless authorized or permitted to do so by this title, a person may not use as a title or describe the services the person provides by use of the words “psychological”, “psychologist”, or “psychology”.