As used in this subchapter:
(1) “Complainant” means the person or persons providing the information constituting the basis for official departmental charges alleging improper conduct;
(2) “Formal proceeding” means a proceeding heard before any officer, committee, or other body of city government with the authority to take disciplinary action against a law enforcement officer;
(3) “Law enforcement officer” means any public servant vested by law with a duty to maintain order or to make arrests for offenses; and
(4) “Official departmental charges” means a written document from the chief of police or other lawful authority notifying the accused law enforcement officer that charges of misconduct have been made and setting forth the specifics of the alleged misconduct.