United States v. Karaouni, 379 F.3d 1139 (9th Cir. Aug. 24, 2004) (checking box on immigration form which has statement next printed next to it saying that the person is a U.S. citizen or national could not form basis for prosecution under 18 U.S.C. 911 because that provision only penalizes claiming to be a citizen; "the district court violated a basic principle of criminal law by allowing the government to prove that an individual committed the charged offense by showing that he committed either that offense or some other act.").