Md. Const. XI-F - Home Rule for Code Counties § 4

Except as otherwise provided in this Article, the General Assembly shall not enact, amend, or repeal a public local law which is special or local in its terms or effect within a code county. The General Assembly may enact, amend, or repeal public local laws applicable to code counties only by general enactments which in term and effect apply alike to all code counties in one or more of the classes provided for in Section 5 of this Article.