Maryland Health - General Section 24-505

      (a)      Except as provided in subsection (b) of this section, this subtitle does not prohibit any county or municipal corporation of the State from enacting an ordinance, resolution, law, or rule that is more stringent than the provisions of this subtitle.

      (b)      Charles County and St. Mary's County may not enact an ordinance, resolution, law, or rule that is more stringent than the provisions of this subtitle.