Md. Code, Bus. Occ. & Prof. § 19-303

(a) In this section, “organized police agency” means: (1) a police department of the State or of a county or municipal corporation of the State; (2) a private police department that is allowed to enroll its officers in approved Maryland Police Training and Standards Commission schools and academies; or (3) a law enforcement agency of the United States, of any state, or of any county or municipal corporation of any state. (b) An individual applicant or, if the applicant is a firm, the representative member shall have: (1) at least 5 years experience as a full–time private detective certified under Title 13 of this article; (2) at least: (i) 5 years of experience as a full–time police officer with an organized police agency; and (ii) completed successfully a police officer training course that is recognized and approved by the Maryland Police Training and Standards Commission; (3) at least 3 years of experience in an investigative capacity as a detective while serving as a police officer with an organized police agency; (4) at least: (i) 3 years of experience in an investigative capacity in any unit of the United States, of the State, or of a county or municipal corporation of the State for the purpose of law enforcement; and (ii) completed successfully the police officer training that is recognized and approved by the Maryland Police Training and Standards Commission; (5) at least: (i) 5 years of experience as a full–time fire investigator for a fire department or law enforcement agency of the State or of a county or municipal corporation of the State; and (ii) completed successfully the training certified by the Maryland Police Training and Standards Commission or the Maryland Fire–Rescue Education and Training Commission; or (6) at least: (i) 5 years of experience as a full–time correctional supervisor in a correctional facility in the State; and (ii) completed successfully the training required by the Correctional Training Commission.