(a) The county may:
(1) adopt an ordinance or resolution supplementing the prohibition against disorderly intoxication under § 6-320 of this article; and
(2) regulate possession or consumption of alcoholic beverages on public property, property used by the public, or on a highway.
(b) In the City of Frederick, the Mayor and Aldermen may regulate the possession or consumption of alcoholic beverages on public property owned by the City or on a public highway.