The following excerpt is from U.S. v. Camacho, 87 F.3d 1323 (9th Cir. 1996):
Whether two statutes define the same offense for purposes of double jeopardy is determined, as a general matter, by applying the "same elements" test of Blockburger v. United States, 52 S.Ct. 180 (1932). Under that test, two offenses are different if each statute requires proof of an element that the other does not.
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