What is the current state of the law on plea agreements that allow a defendant to waive their statutory right to appeal their sentence?

Courts generally enforce plea agreements containing knowing and voluntary waivers of statutory rights of appeal or collateral attack because such "waivers usefully preserve the finality of judgments and sentences imposed pursuant to valid plea agreements." United States v. Anglin, 215 F.3d 1064, 1066 (9th Cir. 2000). A "defendant may waive the statutory right to file a 2255 petition challenging the length of his sentence" but the defendant must (1) expressly waive the right of collateral attack and (2) do so knowingly and voluntarily. United States v. Pruitt, 32 F.3d

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