10th Cir.

United States v. Herrera

May 28, 2026 ·25-6116 ·Panel Decision ·Nancy L. Moritz · By James Taylor

The Tenth Circuit affirmed the dismissal of a defendant's motion to reduce his sentence based on a Sentencing Commission amendment. The court held that the defendant waived his challenge by failing to explain why the district court's reasoning was incorrect.

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Background

Antonio Ortiz Herrera moved for a reduction of his prison sentence after pleading guilty to a drug crime, citing Amendment seven hundred eighty-two to the Sentencing Guidelines. The district court concluded he was ineligible because the amendment had taken effect nearly ten years before his sentence was imposed and had already been accounted for. The district court dismissed his motion, and Herrera appealed without explaining why that reasoning was incorrect.

The court’s reasoning

The court noted that a federal court generally may not modify a term of imprisonment once it has been imposed, though exceptions exist for sentences based on subsequently lowered sentencing ranges. The court found that Herrera waived any challenge to the district court’s decision because he never attempted to explain why the court’s reason for dismissing his motion was wrong. Even if the waiver were overlooked, the court would affirm because Amendment seven hundred eighty-two took effect in two thousand fourteen, and Herrera received his sentence in two thousand twenty-four, meaning the amendment already factored into his sentence.

A federal court generally may not modify a term of imprisonment once it has been imposed.

18 U.S.C. § 3582(c)

What it means going forward

The decision reinforces that defendants must actively challenge the reasoning of a district court’s denial of a sentence reduction motion to avoid waiver. It confirms that sentence reductions based on retroactive guideline amendments are unavailable if the amendment was already applied when the original sentence was imposed.

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