22 U.S.C. § 6045Section
§ 6045. Effect of chapter on lawful United States Government activities
Nothing in this chapter prohibits any lawfully authorized investigative, protective, or intelligence activity of a law enforcement agency, or of an intelligence agency, of the United States.
(Pub. L. 104–114, title I, §115, Mar. 12, 1996, 110 Stat. 803.)
