United States v. Munoz-Fontanez, 61 F.4th 212

Puerto Rico police searched Muñoz's home and car and found five firearms (one modified to fire automatically), 886 rounds of ammunition, 14 magazines, 32 oxycodone/Xanax pills, and small amounts of marijuana; his phone contained videos and photos suggesting drug sales and violence.
A federal grand jury charged Muñoz on six counts; pursuant to a plea agreement he pled guilty to two counts (possession of firearms in furtherance of a drug trafficking crime under 18 U.S.C. § 924(c)(1)(A)(i) and possession with intent to distribute marijuana under 21 U.S.C. § 841(a)(1)).
The government moved to dismiss the remaining four counts, one of which carried a 30-year statutory minimum; the plea agreement recommended a combined sentence of 96–120 months.
The aggregated Guidelines Sentencing Range (GSR) was 60–66 months; the district court imposed an upward variance to 144 months (nearly 2.5× the GSR and 24 months above the plea-range top).
Muñoz appealed, arguing the district court failed to adequately explain its upward variance; because the challenge was unpreserved below, the panel reviewed for plain error.
The First Circuit vacated and remanded for resentencing, holding the district court’s explanation was inadequate because it listed facts but did not tie specific facts to statutory sentencing goals or explain why an upward variance was warranted.

Issue	Plaintiff's Argument	Defendant's Argument	Held
Adequacy of district court's explanation for an upward variance	Court sufficiently explained by recounting facts and noting seriousness; parties' arguments supply rationale	Muñoz: explanation was conclusory and failed to tie specific facts to 3553(a) factors	Vacated — explanation inadequate under plain error review; court must identify specific facts and tie them to sentencing goals
Whether district court's mere recitation of arrest facts permits inference of reasoning	Government: prior argument at sentencing (esp. automatic weapon, number of firearms/ammo) allows inference	Muñoz: listing facts without emphasis leaves unclear which facts motivated variance	Court: cannot reliably infer; listing facts alone is insufficient to explain an upwardly variant sentence
Whether appellate court should reach substantive reasonableness of the sentence	Government: sentence justified by weapons/ammo and public safety concerns	Muñoz: sentence substantively excessive	Court: declined to address substantive reasonableness because procedural error requires remand for explanation first
Remedy for inadequate explanation	Government: remand unnecessary or deferential review	Muñoz: remand for resentencing	Court: vacated sentence and remanded for resentencing with an adequate explanation tying facts to 3553(a) goals

United States v. Soto-Soto, 855 F.3d 445 (1st Cir. 2017) (plain-error standard for unpreserved sentencing objections)
Gall v. United States, 552 U.S. 38 (U.S. 2007) (sentencing courts must adequately explain reasons for sentence and review is deferential but requires justification for variance)
United States v. Montero-Montero, 817 F.3d 35 (1st Cir. 2016) (overturned upward variance for inadequate explanation)
United States v. Mantha, 944 F.3d 352 (1st Cir. 2019) (statutory requirement to explain sentences and remand where explanation insufficient)
United States v. Ramos, 763 F.3d 45 (1st Cir. 2014) (in some circumstances appellate courts may infer district court reasoning from parties' arguments)
United States v. Rivera-Gonzalez, 809 F.3d 706 (1st Cir. 2016) (reversal of upward variance where explanation did not connect facts to sentencing goals)
United States v. Brown, 808 F.3d 865 (D.C. Cir. 2015) (discussing the importance of adequate sentencing explanations under 18 U.S.C. § 3553(c)(2))