Maryland Statutes
Subtitle 2 - Rights and Responsibilities of Innkeepers
Section 15-204 - Payment, Registration and Limitation of Guests

(a)    An innkeeper may require a prospective guest to demonstrate an ability to pay by cash or valid credit card.
    (b)    An innkeeper may require each guest at a lodging establishment to register and may require the guest to produce:
        (1)    a valid driver’s license;
        (2)    a valid military identification card;
        (3)    a valid passport; or
        (4)    any valid government issued identification card.
    (c)    An innkeeper may limit the number of individuals who may occupy a particular guest room in a lodging establishment.