Each plumbing advertisement in the name of a person who engages in the business of providing plumbing services shall contain the license number and name of a master plumber or holder of a limited master plumber license whom the person employs and designates to direct and control the provision of plumbing services through the business of the person.
Md. Code Ann., Bus. Occ. & Prof. § 12-504
Known as the Maryland Plumbing Act
The act spans §§ 12-101 to 12-702 (51 sections).
Official source: Maryland General Assembly. Reproduced from public-domain Maryland statutes; confirm against the official source for the current text. Not legal advice.