er's enforcement effort. For a rare example, see Heath v. Alabama, 474 U.S. 82, 91-93 (1985). 35. See U.S. Const. amend. V (Double Jeopardy Clause); Bartkus v. Illinois, 359 U.S. 121, 136-39 (1959) (affirming power of state to prosecute defendant after a federal prosecution for the same bank robbery); Uni