Amendment 821 § 3582(c)(2) Discretion: Brief § 3553(a) Explanation Suffices and No Duty to Reapply Comparable § 5K1.1 Departure

Introduction

Case: United States v. Simon Zambrano Vargas (11th Cir. Feb. 25, 2026) (unpublished).
Parties: United States (Plaintiff-Appellee) v. Simon Antonio Zambrano Vargas (Defendant-Appellant).
Posture: Appeal from the Middle District of Florida’s denial of a sentence-reduction motion under 18 U.S.C. § 3582(c)(2).

The case arises from a 2019 maritime cocaine-smuggling conspiracy in which the Coast Guard recovered approximately 683 kilograms of cocaine from a “go-fast” vessel in international waters. Zambrano Vargas pleaded guilty and, after a government motion under U.S.S.G. § 5K1.1 (substantial assistance), received a downward-departed sentence of 108 months.

After the Sentencing Commission promulgated Amendment 821 (including new U.S.S.G. § 4C1.1 for certain “zero-point offenders”) and made it retroactive via Amendment 825, Zambrano Vargas sought a further reduction. Although he was eligible (a two-level decrease), the district court denied relief after concluding the § 3553(a) factors weighed against reduction—principally due to the quantity of drugs and the scope of the smuggling venture. The Eleventh Circuit affirmed.

Summary of the Opinion

The Eleventh Circuit held the district court did not abuse its discretion in denying a discretionary reduction under § 3582(c)(2), even where: (i) the defendant was eligible for a reduced guideline range under Amendment 821; (ii) the motion was unopposed; and (iii) the defendant presented mitigating evidence of rehabilitation and personal circumstances.

The court emphasized that at § 3582(c)(2)’s second step, a district court may deny relief based on its weighing of the § 3553(a) factors, need only provide a brief statement making clear it considered the parties’ arguments, and is not required to: (a) discuss each § 3553(a) factor; (b) address each mitigating argument; or (c) re-apply a “comparable” substantial-assistance departure under U.S.S.G. § 1B1.10(b)(2)(B).

Analysis

Precedents Cited

  • United States v. Caraballo-Martinez, 866 F.3d 1233 (11th Cir. 2017): Set the standard of review—denials of § 3582(c)(2) reductions are reviewed for abuse of discretion. The panel used this framework to defer to the district court’s weighing of sentencing considerations.
  • United States v. Jules, 595 F.3d 1239 (11th Cir. 2010): Defines abuse of discretion in this setting as failing to apply the proper legal standard or procedures. The opinion relied on Jules to frame what would count as reversible error in a modification proceeding.
  • United States v. Campbell, 491 F.3d 1306 (11th Cir. 2007): Provides the “range of choice” language—appellate courts will not reverse merely because they might have decided differently. This supported affirmance despite the defendant’s equitable arguments and the unopposed posture.
  • United States v. Bravo, 203 F.3d 778 (11th Cir. 2000): Supplies the canonical two-step § 3582(c)(2) process: (1) recalculate the amended guideline range, then (2) decide whether to reduce in light of § 3553(a). The panel implicitly found step one satisfied and focused on step two discretion.
  • United States v. Williams, 557 F.3d 1254 (11th Cir. 2009): Cited twice for two related propositions: (i) courts may consider post-conviction conduct, and (ii) if the record makes it impossible to tell whether the district court considered § 3553(a), remand is required. Here, the panel found the record sufficient and thus no remand.
  • Concepcion v. United States, 597 U.S. 481 (2022): Although Concepcion addressed a different resentencing mechanism, the panel used its broader principle that sentence-modification courts have discretion and need only make clear they considered the parties’ arguments; a brief statement of reasons can suffice. Concepcion thus reinforced a low procedural-explanation threshold.
  • United States v. Tinker, 14 F.4th 1234 (11th Cir. 2021): Confirmed that a court need not expressly address each § 3553(a) factor and that the weight assigned to any factor is within the court’s discretion. The panel leaned on Tinker to reject the claim that the district court had to specifically respond to rehabilitation and other mitigation.
  • United States v. Eggersdorf, 126 F.3d 1318 (11th Cir. 1997): Supported the proposition that a district court demonstrates § 3553(a) consideration by indicating it reviewed the filings and was duly advised, even without a factor-by-factor analysis. The panel treated the district court’s order and its reference to § 3553(a) as adequate under Eggersdorf.
  • United States v. Marroquin-Medina, 817 F.3d 1285 (11th Cir. 2016): Critical to the substantial-assistance issue: even when U.S.S.G. § 1B1.10(b)(2)(B) allows a “comparably less” sentence, the court is not required to depart again. The panel used Marroquin-Medina to reject any claimed entitlement to a comparable reduction.
  • United States v. Amedeo, 487 F.3d 823 (11th Cir. 2007): Provided the principle that a court’s failure to discuss a mitigating fact does not mean it ignored it. This supported the inference that rehabilitation arguments may have been considered even if not mentioned.
  • United States v. Velasquez Velasquez, 524 F.3d 1248 (11th Cir. 2008): Addressed the caution against sentencing based on unfounded immigration assumptions or personal immigration-policy views. The panel distinguished this case, concluding the district court merely noted the ICE detainer and did not rely on it as the basis for denial.

Legal Reasoning

  1. Eligibility does not guarantee relief. The court accepted that Amendment 821 lowered the applicable guideline range (step one), but emphasized § 3582(c)(2) remains discretionary at step two. This distinction is the engine of the affirmance: even an eligible, well-supported, unopposed motion can be denied if the court finds § 3553(a) factors counsel against reduction.
  2. A brief explanation is enough if it shows § 3553(a) consideration. The district court stated it was guided by § 3553(a) and explained that the offense’s nature—especially the large quantity (683 kg) in a “large maritime smuggling venture”—weighed against reduction. Under Concepcion v. United States, United States v. Tinker, and United States v. Eggersdorf, that level of explanation satisfied procedural requirements.
  3. No obligation to re-apply a comparable substantial-assistance departure. Even though the probation memorandum described how a “comparable departure” could yield a lower range, the panel relied on United States v. Marroquin-Medina to reiterate that U.S.S.G. § 1B1.10(b)(2)(B) is permissive. The district court could decline to grant any further departure, and it could treat the prior departure as a reason to refrain from further leniency.
  4. Mitigation and rehabilitation are permissive considerations, not mandates. The panel acknowledged the district court could consider post-sentencing conduct (United States v. Williams), but held it was not required to reduce a sentence on that basis, nor required to explicitly discuss it (United States v. Amedeo).
  5. Immigration detainers: improper reliance vs. permissible mention. The defendant argued error “to the extent” the ICE detainer mattered. The panel, invoking United States v. Velasquez Velasquez, found no indication the district court denied relief because of immigration status or policy views; it only noted the detainer after already identifying the offense nature as the dispositive concern.

Impact

Although unpublished, the decision reinforces (and operationalizes) a practical rule in Amendment 821 retroactivity litigation within the Eleventh Circuit: district courts retain broad discretion to deny § 3582(c)(2) reductions and may do so with succinct reasoning, so long as the record reflects consideration of § 3553(a) and the parties’ arguments.

Three likely effects follow:

  • High deference on appeal where the district court identifies one or two salient § 3553(a) considerations (here, drug quantity and scope).
  • Reduced leverage of “unopposed” motions: agreement by the government does not constrain the court’s independent § 3553(a) analysis.
  • Clarification of expectations around prior departures: defendants cannot treat a prior § 5K1.1 departure as creating a presumption of a renewed comparable reduction after a retroactive amendment.

Complex Concepts Simplified

18 U.S.C. § 3582(c)(2)
A mechanism allowing a court to reduce a previously imposed prison term when the Sentencing Commission later lowers the guideline range and makes the change retroactive. It is not a full resentencing; it is a limited sentence-modification proceeding.
Two-step process (from United States v. Bravo)
Step 1: Recalculate the guideline range using the retroactive amendment. Step 2: Decide whether to reduce the sentence after considering § 3553(a) factors (and potentially post-sentencing conduct).
Amendment 821 / U.S.S.G. § 4C1.1 (“zero-point offenders”)
A guideline change that can reduce offense level by two levels for certain defendants who have no criminal-history points and meet other criteria. Amendment 825 made the relevant portion retroactive.
Substantial assistance / U.S.S.G. § 5K1.1
A government-sponsored request for a lower sentence because the defendant helped authorities (e.g., cooperation). If a defendant later becomes eligible for a guideline reduction, the court may—but need not—grant a “comparably less” sentence under U.S.S.G. § 1B1.10(b)(2)(B).
§ 3553(a) factors
The statutory considerations that guide sentencing decisions (and, here, the discretionary decision whether to reduce), including the nature of the offense, the defendant’s history and characteristics, deterrence, public protection, and avoiding unwarranted disparities.
ICE detainer
A notice that immigration authorities may seek custody of a noncitizen after completion of a criminal sentence. Courts cannot base sentencing decisions on unfounded immigration assumptions or personal immigration-policy views, but merely noting a detainer is not necessarily reversible error if it was not a basis for the decision.

Conclusion

United States v. Simon Zambrano Vargas underscores that Amendment 821 eligibility is only the beginning of the § 3582(c)(2) inquiry. The decisive lesson is procedural and discretionary: a district court may deny a reduction after briefly stating it considered § 3553(a) and identifying a key factor—here, the extraordinary drug quantity and the seriousness of a large maritime-smuggling venture—without addressing every mitigation point. The opinion also reiterates there is no requirement to re-apply a comparable substantial-assistance departure and cautions that immigration-related facts only become problematic when they serve as an improper basis for sentencing outcomes.