United States v. Valdiviez-Garza, 669 F.3d 1199 (11th Cir. Feb. 6, 2012) (Government is collaterally estopped from attempting to establish alienage because a jury, in a re-entry case, found against the Government); see United States v. Bennett, 836 F.2d 1314, 1316 (11th Cir.1984) (barring prosecution completely if fact necessarily determined in former trial is essential element for conviction in present proceeding).