The Department of Forensic Science (DFS), established by Virginia law, provides “forensic laboratory services upon request of the Superintendent of State Police; the Chief Medical Examiner, the Assistant Chief Medical Examiners, and local medical examiners; any attorney for the Commonwealth; any chief of police, sheriff, or sergeant responsible for law enforcement in the jurisdiction served by him; any local fire department; the head of any private police department that has been designated as a criminal justice agency by the Department of Criminal Justice Services as defined by § 9.1-101; or any state agency in any criminal matter. The Department shall provide such services to any federal investigatory agency within available resources.” (Code of Virginia, § 9.1-1101, emphasis added)