United States v. Graham, 976 F.3d 59

In 2015 Graham met J.R., a heroin-addicted woman who engaged in prostitution; he supplied drugs, coerced and beat her, directed online ads, retained her earnings, and transported her between ME, NH, and MA for prostitution.
J.R. suffered multiple severe beatings; after a December 2015 assault she sought medical help and reported being beaten and forced into prostitution.
Graham was charged with two counts of sex trafficking (18 U.S.C. §1591), two drug distribution counts (21 U.S.C. §841), and two Mann Act counts (18 U.S.C. §2421); he pled guilty to all counts in January 2019.
For sentencing, the probation office and government sought a two-level "vulnerable victim" enhancement under U.S.S.G. §3A1.1(b)(1); Graham objected, arguing J.R.’s vulnerability was typical for the offense and not "unusually vulnerable."
The district court applied the enhancement only to the December 2015 sex-trafficking counts (and treated counts separately), producing an offense level of 41 (Guidelines 360 months–life); the court imposed 320 months on the trafficking and drug counts and concurrent 120 months on the Mann Act counts.
On appeal Graham challenged the vulnerable-victim enhancement; the First Circuit reviewed for abuse of discretion (fact findings for clear error, Guidelines interpretations de novo).

Issue	Plaintiff's Argument	Defendant's Argument	Held
Whether §3A1.1(b)(1) vulnerable‑victim enhancement applied	Government: J.R. was unusually vulnerable by Dec 2015 due to severe beatings, emotional abuse, and drug dependence; Graham knew or should have known this	Graham: J.R.’s vulnerability was typical for sex‑trafficking victims and thus not the "unusually vulnerable" baseline the Guideline requires	District court applied the enhancement to the December 2015 trafficking counts; First Circuit did not overturn that factual/Guidelines determination
Whether any erroneous application of the enhancement requires resentencing	Government: enhancement proper and supported; sentence appropriate	Graham: even if Guideline application errored, the enhancement went to the heart of the sentence and was not harmless	Court held any error harmless: Guidelines range would have been the same, record shows the court’s sentencing decision wasn’t driven by the specific enhancement, so sentence affirmed

United States v. Zapata‑Vázquez, 778 F.3d 21 (1st Cir. 2015) (source for facts on guilty‑plea appeals)
United States v. Martínez‑Mercado, 919 F.3d 91 (1st Cir. 2019) (standard of review for sentencing)
United States v. Romero, 906 F.3d 196 (1st Cir. 2018) (harmlessness when Guidelines range unchanged)
United States v. Ponzo, 853 F.3d 558 (1st Cir. 2017) (harmless‑error principles in sentencing)
United States v. Battle, 637 F.3d 44 (1st Cir. 2011) (collecting harmless‑error authorities)
United States v. Alphas, 785 F.3d 775 (1st Cir. 2015) (error harmless only if sure it did not affect sentence)
United States v. Goergen, 683 F.3d 1 (1st Cir. 2012) (distinguishing reliance on facts from reliance on Guidelines math)