As used in this chapter, unless the context requires a different meaning:
"Agency" means the Department of State Police, the Division of Capitol Police, the Virginia Marine Resources Commission, the Virginia Port Authority, the Department of Wildlife Resources, the Virginia Alcoholic Beverage Control Authority, the Department of Conservation and Recreation, or the Department of Motor Vehicles; or the political subdivision or the campus police department of any public institution of higher education of the Commonwealth employing the law-enforcement officer.
"Law-enforcement officer" means any person, other than a Chief of Police or the Superintendent of the Department of State Police, who, in his official capacity, is (i) authorized by law to make arrests and (ii) a nonprobationary officer of one of the following agencies:
For the purposes of this chapter, "law-enforcement officer" shall not include the sheriff's department of any city or county.
Va. Code § 9.1-500