There is a newer version of the Maryland Code
Maryland Business Occupations and Professions Section 19-406
§ 19-406.
  (a)   At any time that a certified security guard provides a security guard service, the security guard shall carry the certification card issued under § 19-405 of this subtitle.
  (b)   On request of a law enforcement officer, a certified security guard shall show the security guard's certification card.
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