Md. Code, Pub. Safety § 3-502

(a) In this section, “police officer” means a member of: (1) a police force of this State or another state; (2) a police force of a county or municipal corporation of this State or another state; (3) the United States Secret Service Uniformed Division; (4) the United States Park Police; (5) the Washington Metropolitan Area Transit Authority (WMATA) Metro Transit Police; (6) the Federal Bureau of Investigation; (7) the Drug Enforcement Administration; or (8) a division of a federal agency the primary duties of which are the investigation, apprehension, or detention of individuals suspected or convicted of federal crimes. (b) A person may not, with fraudulent design on person or property, falsely represent that the person is a police officer, special police officer, sheriff, deputy sheriff, or constable. (c) Except as provided in subsection (e) of this section, a person may not have, use, wear, or display a uniform, shield, button, ornament, badge, identification, or shoulder patch adopted by the Department of State Police to be worn by its members, insignia, or emblem of office, as is worn by a police officer, sheriff, deputy sheriff, or constable. (d) A person may not, for the purpose of deception, have a simulation or imitation of an article described in subsection (c) of this section as is worn by a police officer, sheriff, deputy sheriff, or constable. (e) A person may have, use, wear, or display an article described in subsection (c) of this section with the appropriate authority of: (1) the Secretary of State Police; (2) a police force of another state; (3) the Police Commissioner of Baltimore City; (4) the chief of police of a county or municipal corporation of this State or another state; (5) a sheriff or deputy sheriff; (6) a constable; (7) the United States Secret Service Uniformed Division; (8) the United States Park Police; (9) the Washington Metropolitan Area Transit Authority (WMATA) Metro Transit Police; (10) the Federal Bureau of Investigation; (11) the Drug Enforcement Administration; or (12) a division of a federal agency the primary duties of which are the investigation, apprehension, or detention of individuals suspected or convicted of federal crimes. (f) A person who violates this section is guilty of a misdemeanor and on conviction is subject to imprisonment not exceeding 2 years or a fine not exceeding $2,000 or both.