Maryland Business Occupations and Professions Section 12-305.1
§ 12-305.1.
  (a)   Subject to the provisions of this section, the Board may waive the examination requirements for a master plumber license or a journey plumber license for an individual who is licensed to provide plumbing services in another state on the affirmative vote of at least a majority of the authorized membership of the Board.
  (b)   The Board may grant a waiver under this section only if an applicant:
    (1)   pays the appropriate fee required under § 12-306 of this subtitle; and
    (2)   provides adequate evidence that the applicant:
      (i)   meets the qualifications otherwise required by this title;
      (ii)   holds an active license in good standing in the other state;
      (iii)   holds a license that is equivalent to the State license; and
      (iv)   became licensed in the other state after meeting requirements that are at least equivalent to the licensing requirements of this State.
  (c)   The Board may grant a waiver only if the state in which the applicant is licensed waives the examination of licensees of this State to a similar extent as this State waives the examination requirements for individuals licensed in that state.