Md. Const. art. XI-F, § 10
All laws enacted by the General Assembly and in effect when this Article was added to the Constitution shall remain in effect until amended or repealed under the Constitution. Every public local law enacted, amended, or repealed by a county under the provisions of this Article prevails over the previous public local law, except to the extent it is subject to an applicable law enacted by the General Assembly.
Acts 1965, c. 493, ratified Nov. 8, 1966.