Maryland Code, BUSINESS OCCUPATIONS AND PROFESSIONS 13-406
(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 § 13-407 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 private detective;
(ii) the name of the licensed private detective agency with or by which the individual is associated or employed; and
(iii) any information that the Secretary considers appropriate to:
1. identify the individual; or
2. specify the authority of the individual.