Maryland Alcoholic Beverages Section 12-109
§ 12-109.
  (1)   Every licensee under the provisions of this article may cause a book to be kept and such licensee or his employee, or both, may require any person who has shown documentary proof of age, which substantiates his age to allow the legal purchase of alcoholic beverages, to sign such book if the age of such person is in question. The book shall contain copies of the following form upon which the licensee or his employee shall record all information required by each and all sections of the form:
  Date................ 20.... To Be Filled in by Seller
IDENTIFICATION (CHECK ALL SHOWN)
Driver's License   []     Army I.D. Card   []
Birth Certificate   []     Coast Guard I.D. Card   []
Service Discharge   []     Marine I.D. Card   []
Draft Card   []     Navy I.D. Card   []
Air Force I.D. Card   []  
Other (Specify)
DESCRIPTION OF PURCHASER
Height       Weight  
Color of Eyes       Color of Hair
Outstanding Features
_____
_____
_____
Seller's Signature
To Be Filled in by Prospective Purchaser
I declare I am of legal age to purchase fermented malt beverages or intoxicating liquor, and that I am subject to arrest and prosecution for misrepresenting my age.
Print full name
Street address
City   State   Signature  
No.
  (2)   The establishment of the following facts by a person making a sale of alcoholic beverages to a person not of legal age shall constitute prima facie evidence of innocence and a defense to any prosecution therefor:
    (a)   That the purchaser falsely represented in writing and supported with other documentary proof that he was of legal age to purchase alcoholic beverages.
    (b)   That the appearance of such purchaser was such that an ordinary and prudent person would believe him to be of legal age to purchase alcoholic beverages.
    (c)   That the sale was made in good faith and in reliance upon the written representation and appearance of the purchaser in the belief that the purchaser was of legal age to purchase alcoholic beverages.