; or (5) the targeting of a United States citizen for the acquisition of foreign intelligence information. (b) Any information concerning a United States citizen acquired under Executive Order 12333 ( 50 U.S.C. 3001 note; relating to United States intelligence activities) shall not be used in evidence against that United States citizen in any criminal, civil, or administrative proceeding or as part of any criminal, civil, or administrative investigation. 5. Limitation on use of information concerning United States citizens Any information concerning a United States citizen acquired during surveillance of a non-United States citizen shall not be used in evidence against that United States citizen in any criminal, civil, or administrative proceeding or as part of any criminal, civil, or administrative investigation. 6. Criminal sanctions (a) A person is guilty of an offense if he intentionally— (1) engages in any of the offenses described in section 4, except as authorized by this Act, title 18, or any express statutory authorization that is an additional exclusive means for conducting electronic surveillance under section 1812 of title 50