Md. Code, Alc. Bev. & Cannabis § 23-1904

(a) (1) The holder of a Class A or Class D license or an employee of the license holder may deliver alcoholic beverages only within the county. (2) An employee making a delivery shall meet the age requirements of § 23–1902 of this subtitle. (b) The deliverer and individual receiving the delivery shall, at the time of delivery, endorse a delivery form that the Board approves, certifying that: (1) the individual receiving the delivery claimed to be at least 21 years old and the claim was supported by documentary evidence; (2) the individual receiving the delivery knew that it is a criminal offense for alcoholic beverages to be given to an individual under the age of 21 years; and (3) the deliverer examined the recipient’s identification. (c) A license holder or an employee of a license holder may not make a retail delivery of alcoholic beverages unless the purchaser: (1) or another individual at least 21 years old designated by the purchaser, is physically present to receive the alcoholic beverages at the time and place of delivery; and (2) pays for the purchase at the time of the order.