Maryland Alcoholic Beverages Section 19-202

      (a)      A person may not drink any alcoholic beverage, as defined in this article, while:

            (1)      On public property, unless authorized by a governmental entity that has jurisdiction over the property;

            (2)      On the mall, adjacent parking area, or other outside area of any combination of privately owned retail establishments, like a shopping center, where the general public is invited for business purposes, unless authorized by the owner of the shopping center;

            (3)      On an adjacent parking area or other outside area of any other retail establishment, unless authorized by the owner of the establishment; or

            (4)      In any parked vehicle located on any of the places enumerated in this subsection, unless authorized.

      (b)      Subsection (a) does not apply to the consumption of alcoholic beverages by passengers in the living quarters of a motor home equipped with a toilet and central heating or the passengers of a chartered bus in transit if the owner or operator has consented to the consumption of the beverages.