Nelson Agustín Gonzalez, federal prisoner # 03792-131, moves for leave to proceed in forma pauperis (IFP) on appeal and has filed a brief in support of his appeal. Relying on United States v. Booker, 543 U.S. 220, 125 S.Ct. 738, 160 L.Ed.2d 621 (2005), Gonzalez seeks to challenge the district court’s denial of his 18 U.S.C. § 3582(c)(2) motion to reduce the sentence he received for engaging in a continuing criminal enterprise, possession of marijuana with the intent to distribute, money laundering, and being a felon in possession of a firearm. The district court also denied Gonzalez’s motion for leave to proceed IFP and certified that an appeal would not be taken in good faith.

Gonzalez’s IFP motion is construed as a challenge to the district court’s certification. See Baugh v. Taylor, 117 F.3d 197, 202 (5th Cir. 1997). He has failed to show that his appeal involves “legal points arguable on their merits (and therefore not frivolous).” Howard v. King, 707 F.2d *444 215, 220 (5th Cir. 1983) (internal quotation marks omitted); see § 3582; United States v. Shaw, 30 F.3d 26, 29 (5th Cir. 1994). Accordingly, the motion for leave to proceed IFP on appeal is DENIED, and the appeal is DISMISSED as frivolous. See Baugh, 117 F.3d at 202 & n. 24; 5th Cir. R. 42.2. Gonzalez is WARNED that the filing or prosecution of frivolous appeals in the future will subject him to sanctions.