Reginald Strother, federal prisoner # 12594-078, was convicted of possession with intent to distribute 50 grams or more of cocaine base and is serving a life sentence. United States v. Strother, 387 Fed.Appx. 508 (5th Cir. 2010) (affirming conviction). Strother has appealed the district court’s order dismissing his application for a writ of habeas corpus under 28 U.S.C. § 2241, in which Strother contended that the trial court in his criminal case lacked jurisdiction.

Strother has moved for leave to file a supplemental brief. The motion is GRANTED.

Strother has failed to brief the district court’s principal holding that his jurisdictional challenge could not be asserted in a § 2241 application. See Brinkmann v. Dallas County Deputy Sheriff Abner, 813 F.2d 744, 748 (5th Cir. 1987) (appellant’s failure to challenge the district court’s legal analysis or its application in his case, “[i]n practical effect, ... is the same as if he had not appealed that judgment.”); Yohey v. Collins, 985 F.2d 222, 224-25 (5th Cir. 1993) (issues not briefed adequately are waived); see also Tolliver v. Dobre, 211 F.3d 876, 877-78 (5th Cir. 2000).

The appeal is DISMISSED AS FRIVOLOUS. We CAUTION Strother that the *412 filing of frivolous appeals and other pleadings will invite the imposition of a sanction.