Cardozo-Tlaseca v. Gonzales, 460 F.3d 1102 (9th Cir. Aug. 21, 2006) ("for the government to carry its burden in establishing that a conviction remains valid for immigration purposes, the government must prove "with clear, unequivocal and convincing evidence, that the Petitioner's conviction was quashed solely for rehabilitative reasons or reasons related to his immigration status, i.e., to avoid adverse immigration consequences.") (original emphasis), citing Pickering v. Gonzales, 454 F.3d 525 (6th Cir. 2006), vacating Matter of Pickering, 23 I. & N. Dec. 621 (BIA 2003).