As used in this chapter, unless the context requires a different meaning: “Law-enforcement agency” means a law-enforcement agency with jurisdiction over the search for a suspect in a case involving the death or serious injury of a law-enforcement officer or an agency employing a law-enforcement officer who is missing in the line of duty. “Law-enforcement officer” means any full-time or part-time employee of the Department of State Police or a police department or sheriff’s office that is a part of or administered by the Commonwealth or any political subdivision thereof, and any campus police officer appointed under Article 3 (§ 23.1-809 et seq.) of Chapter 8 of Title 23.1, who is responsible for the prevention and detection of crime and the enforcement of the penal, traffic, or highway laws of the Commonwealth.