Md. Code, Criminal Law § 10–118

(a) Except for a person licensed as an alcoholic beverages licensee under the Alcoholic Beverages and Cannabis Article who possesses a keg in the course of that person’s business, a person may not knowingly:

(1) possess a keg that has not been registered under or does not have a registration form affixed to it as required by § 5–303 of the Alcoholic Beverages and Cannabis Article; or

(2) remove, alter, or obliterate, or allow to be removed, altered, or obliterated, a registration form that is affixed to a keg.

(b) A person may not allow an individual under the age of 21 years to consume any of the contents of a keg purchased by that person.