Maryland Statutes
Part II - Prohibited Acts by License Holder
Section 6-306 - Defense to Prosecution for Sale to Underage Individual

The establishment of the following facts by a seller of alcoholic beverages to an underage individual is prima facie evidence of innocence and a defense to a prosecution for serving alcoholic beverages to an underage individual:
        (1)    the purchaser falsely represented in writing and supported with other documentary evidence that the purchaser was of legal age to purchase alcoholic beverages;
        (2)    on the basis of the appearance of the purchaser, an ordinary and prudent individual would believe the purchaser to be of legal age to purchase alcoholic beverages; and
        (3)    the sale was made in good faith and in reliance on the written representation and appearance of the purchaser.