Md. Code, Alcoholic Beverages and Cannabis § 25–2501

A location under the control or possession of an establishment may not:

(1) sell or serve alcoholic beverages to a member or guest;

(2) keep alcoholic beverages for a member or guest;

(3) allow a customer to consume or to be served or given alcoholic beverages from the supplies that the customer has previously purchased or reserved; or

(4) sell, serve, keep, or allow to be consumed setups or other component parts of mixed alcoholic drinks to a member or guest.