Maryland Alcoholic Beverages Section 8-211.1
§ 8-211.1.
  (a)   The Frederick County Board of License Commissioners may issue a stadium on-sale license to the owner of any professional baseball team franchise, whether the franchise is a partnership, corporation, or limited liability company.
  (b)   The stadium on-sale license authorizes the holder to sell beer and light wine at the stadium in which the baseball team plays its home games only under the following circumstances:
    (1)   In plastic, styrofoam, or paper containers on the stadium premises;
    (2)   For consumption on the licensed premises;
    (3)   To persons present at any event held in the stadium; and
    (4)   From the time the stadium opens for the event until the event ends.
  (c)   The annual fee for the stadium on-sale license is $2,000.
  (d)   Except for a manufacturer or distributor of beer who is conducting business with the licensee for purposes of this section, the licensee may not permit any person to:
    (1)   Carry any alcoholic beverages onto the licensed premises; or
    (2)   Carry any alcoholic beverages from the licensed premises.