For purposes of this article only, and unless a different meaning plainly is required:
(1) "Criminal justice enforcement personnel" means those persons within the state criminal justice system who are actually employed as members of the State Police, members of the Division of Protective Services, natural resources police officers, chiefs of police and police of incorporated municipalities, and county sheriffs and their deputies and whose primary duties are the investigation of crime and the apprehension of criminals.
(2) "Head of a law-enforcement agency" means the Superintendent of the State Police, the Director of the Division of Protective Services, the chief natural resources police officer of the Division of Natural Resources, a chief of police of an incorporated municipality, a county sheriff or the Director of the Division of Forestry.
(3) "State or local law-enforcement officer" means any duly authorized member of a law-enforcement agency who is authorized to maintain public peace and order, prevent and detect crime, make arrests and enforce the laws of the state or any county or municipality thereof, other than parking ordinances, and includes persons employed as campus police officers at state institutions of higher education in accordance with the provisions of section five, article four, chapter eighteen-b of this code, although those institutions may not be considered law-enforcement agencies.
(4) "Head of campus police" means the superintendent or administrative head of state or local law-enforcement officers employed as campus police officers at state institutions of higher education in accordance with the provisions of section five, article four, chapter eighteen-b of this code.