Maryland Business Occupations and Professions Section 13-303
§ 13-303.
  (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 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 of experience as a full-time certified or licensed private detective;
    (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 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 required by the Maryland Police Training Commission; or
    (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 Commission or the Maryland Fire-Rescue Education and Training Commission.