Maryland Code, BUSINESS OCCUPATIONS AND PROFESSIONS 19-405
(b) (1) Subject to this subsection, the Secretary shall determine the form and content of the certification card.
(2) The certification card shall be of a size and made of materials appropriate for its intended use, as provided under § 19-406 of this subtitle.
(3) The certification card shall contain:
(i) a statement that in substance specifies that the individual is certified by the Secretary as a security guard;
(ii) any information that the Secretary considers appropriate to:
1. identify the individual; or
2. specify the authority of the individual; and
(iii) the date on which the certification expires.