(a) Subject to subsection (b) of this section and unless a person holds a permit issued by the Board, the person may not represent to the public, by the use of a title, including 'licensed professional engineers', 'professional engineers', or 'registered engineers', by the use of the term 'professional engineering' or 'engineering', by description of services, methods, or procedures, or otherwise, that the person holds a permit or otherwise is authorized to operate a business through which engineering is practiced in the State. (b) Subsection (a) of this section does not apply to a professional engineer who operates the business as a sole practitioner.
Maryland Legal Code