There is a newer version of the Maryland Code
Maryland Business Occupations and Professions Section 13-407
§ 13-407.
  (a)   At any time that a certified private detective provides a private detective service, the private detective shall carry the certification card issued under § 13-406 of this subtitle.
  (b)   On request of a law enforcement officer, a certified private detective shall show the private detective's certification card.
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