Md. Code, Alcoholic Beverages and Cannabis § 6-210
§6–210.
(a) A political subdivision of the State may not adopt an ordinance or a resolution identical to or in addition to § 6–320 of this title.
(b) An existing ordinance, resolution, or other legislation adopted by a political subdivision of the State that is inconsistent with § 6–320 of this title is repealed.