Md. Code Ann., Bus. Occ. & Prof. § 12-402
(a) A master plumber, holder of a limited master plumber license, or other person who engages in the business of providing plumbing services under this subtitle may employ an individual who is not a master plumber or holder of a limited master plumber license to provide or assist in providing plumbing services if the individual:
(1) is licensed:
Added by Acts 1989, c. 3, § 1, eff. Oct. 1, 1989.
Formerly Art. 56A, § 3-402.