Md. Code, Criminal Procedure § 2–109

(a) At the commencement of a traffic stop or other stop, absent exigent circumstances, a police officer shall:

(1) display proper identification to the stopped individual; and

(2) provide the following information to the stopped individual:

(i) the officer’s name;

(ii) the officer’s identification number issued by the law enforcement agency the officer is representing;

(iii) the name of the law enforcement agency the police officer is representing; and

(iv) the reason for the traffic stop or other stop.

(b) A police officer’s failure to comply with subsection (a) of this section:

(1) may be grounds for administrative disciplinary action against the officer; and

(2) may not serve as the basis for the exclusion of evidence under the exclusionary rule.

(c) A police officer may not prohibit or prevent a citizen from recording the police officer’s actions if the citizen is otherwise acting lawfully and safely.