Dung Phan v. Holder, 667 F.3d 448, 451 n.4 (4th Cir. Feb. 1, 2012) (argument that District of Columbia conviction of distribution of cocaine under the District of Columbia Youth Rehabilitation Act, D.C. Code 24"901, et seq., did not constitute a conviction under INA 101(a)(48)(A), 8 U.S.C. 1101(a)(48)(A), for immigration purposes, was waived since petitioner did not raise this argument in his brief on appeal); see United States v. Al"Hamdi, 356 F.3d 564, 571 n. 8 (4th Cir.2004) (It is a well settled rule that contentions not raised in the argument section of the opening brief are abandoned.); Yousefi v. I.N.S., 260 F.3d 318, 326 (4th Cir.2001) (finding that argument not raised in opening appellate brief was abandoned).