Brikova v. Holder, 699 F.3d 1005 (8th Cir. Nov. 7, 2012) (Minnesota conviction of possession of cocaine, for which defendant would have been eligible for Federal First Offender Act treatment, under 18 U.S.C. 3607(a), was not eliminated for immigration purposes by state rehabilitative relief, since equal protection challenge fails because there are multiple potential rational bases for distinguishing between federal and state defendants).