Castaneda-Castillo — Fifth Circuit upheld sentence based on an earlier, uncharged gun-smuggling incident

Case
United States of America v. Luis Ramon Castaneda-Castillo
Court
U.S. Court of Appeals for the Fifth Circuit
Judge
Don R. Willett (Donald J. Trump, 2017); Stuart Kyle Duncan (Donald Trump, 2018); Kurt D. Engelhardt (Donald Trump, 2018)
Date Decided
August 21, 2026
Docket No.
25-51005
Topics
Federal Sentencing; Relevant Conduct; Firearms Smuggling; Presentence Reports
Source
Read the full opinion

Background

Luis Ramon Castaneda-Castillo pleaded guilty to smuggling goods from the United States in December 2023, in violation of 18 U.S.C. § 554. When calculating his base offense level under U.S.S.G. § 2M5.2, the district court considered firearms associated with a separate November 2022 smuggling incident in addition to the firearm involved in the offense of conviction.

Castaneda-Castillo argued on appeal that the earlier incident should not count as relevant conduct because he had not been arrested or charged for it, the government had not proved it by a preponderance of the evidence, and it was not part of the same course of conduct as the offense of conviction.

The Court’s Holding

The Fifth Circuit affirmed. It held that conduct may be considered at sentencing even when the defendant was never arrested, charged, or convicted for it. The unrebutted factual allegations in the presentence report also provided a sufficient evidentiary basis for finding that the November 2022 incident more likely than not occurred.

The court further concluded that the district court could reasonably treat the incidents as part of the same course of conduct. Although they occurred approximately 13 months apart, both involved Castaneda-Castillo driving a pickup truck with the same cargo trailer, concealing firearms, firearm parts, and ammunition inside, and attempting to cross a Texas Border Patrol checkpoint. Those distinctive similarities supported treating the events as a course of conduct rather than isolated incidents. At minimum, Castaneda-Castillo failed to establish a clear or obvious error under plain-error review.

Key Takeaways

  • Uncharged conduct may qualify as relevant conduct for purposes of calculating a federal sentence.
  • Unrebutted factual allegations in a presentence report can supply sufficient evidence for a sentencing court’s factual findings.
  • Distinctive similarities between incidents can establish the same course of conduct despite relatively weak temporal proximity.

Why It Matters

The decision illustrates the breadth of relevant-conduct sentencing and the importance of specifically rebutting factual allegations in a presentence report. It also shows that, when incidents are separated by substantial time, recurring methods, vehicles, concealment practices, and objectives may still connect them as a single course of conduct.

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