United States v. Madrigal-Valadez, 561 F.3d 370, 373-374 (4th Cir. Apr. 1, 2009) (possible collateral immigration consequence of inadmissibility, as a result of criminal conviction, is sufficient to prevent direct criminal appeal from conviction from becoming moot), citing Sibron v. New York, 392 U.S. 40, 55, 88 S.Ct. 1889, 20 L.Ed.2d 917 (1968) ("[t]he mere possibility that" a conviction may result in collateral consequences "is enough to preserve a criminal case from ending ignominiously in the limbo of mootness. "); cf. Parker v. Ellis, 362 U.S. 574, 577, 80 S.Ct. 909, 4 L.Ed.2d 963 (1960) (dissenting opinion).