Post-Remand Petrozziello Challenges: Deference, Harmless Error, and Plain-Error Waiver for Unpreserved Statement-Specific Attacks

1. Introduction

United States v. Quinones-Santiago (1st Cir. Mar. 20, 2026) is the First Circuit’s post-remand resolution of hearsay/admissibility disputes arising from a joint trial of three defendants—Luis H. Quiñones-Santiago, Eduardo Rosario-Orangel, and Avelino Millán-Machuca—convicted of (i) RICO conspiracy, 18 U.S.C. § 1962(d), and (ii) drug-trafficking conspiracy, 21 U.S.C. § 846.

The prosecution theory centered on La Asociación Ñeta (“La Ñeta”), alleged to have evolved from a prisoner advocacy group into a racketeering enterprise engaged in large-scale prison drug trafficking and violence. In an earlier consolidated appeal, the First Circuit rejected other claims but remanded because the District Court had not made the “key findings” required to admit alleged coconspirator statements under United States v. Petrozziello. The remand was limited: the district judge was to make the missing admissibility findings, after which the First Circuit would complete appellate review.

On remand, the District Court made global findings that the challenged statements were made by coconspirators “during and in furtherance” of the conspiracy and were supported by “ample extrinsic evidence.” The appeal returned with supplemental briefing focused on statement-specific admissibility, harmless error, and (for Millán) cumulative error.

2. Summary of the Opinion

The First Circuit affirmed the convictions of Quiñones, Rosario, and Millán. It held, statement-by-statement, that:

  • Most challenged statements were properly admitted as coconspirator statements under Petrozziello and Fed. R. Evid. 801(d)(2)(E);
  • Any arguable missteps were harmless in light of substantial unchallenged inculpatory evidence;
  • New or insufficiently preserved challenges were rejected where defendants failed to carry (or even meaningfully invoke) plain-error review;
  • Millán’s cumulative error claim failed even assuming multiple Petrozziello errors, given “overwhelming” admissible evidence.

The court also bypassed threshold disputes about whether defendants had objected contemporaneously or adequately identified statements earlier, because it could reject the challenges on the merits and/or harmless error.

3. Analysis

A. Precedents Cited

1) The Petrozziello framework and its agency rationale

  • United States v. Petrozziello, 548 F.2d 20 (1st Cir. 1977): Anchors the First Circuit’s approach to Fed. R. Evid. 801(d)(2)(E), requiring a preponderance showing that a statement was made by a coconspirator “during and in furtherance of the conspiracy.”
  • Anderson v. United States, 417 U.S. 211 (1974): Supplies the conceptual foundation—coconspirators are treated as “agents,” so statements bind others only when made within the “scope” of the conspiracy and “in furtherance” of it.
  • United States v. Machor, 879 F.2d 945 (1st Cir. 1989): Earlier remand was justified because it was “not apparent” the preponderance standard was met without the missing findings.
  • United States v. Ramos-Baez, 86 F.4th 28 (1st Cir. 2023): (i) Required “extrinsic evidence beyond the statement itself” to corroborate membership; (ii) supplied substantive standards for RICO conspiracy proof referenced repeatedly on this return trip.

2) Appellate review, affirmance grounds, and harmless error

  • United States v. Ciresi, 697 F.3d 19 (1st Cir. 2012): Preserved Petrozziello rulings are reviewed for clear error; also used for “in furtherance” examples (statements forestalling dissension).
  • Segrain v. Duffy, 118 F.4th 45 (1st Cir. 2024) and United States v. Barone, 114 F.3d 1284 (1st Cir. 1997): The First Circuit may affirm “on any ground apparent from the record.”
  • United States v. Piper, 298 F.3d 47 (1st Cir. 2002): Supports resolving evidentiary challenges on harmless-error grounds.
  • United States v. Valdivia, 680 F.3d 33 (1st Cir. 2012) and United States v. Veloz, 948 F.3d 418 (1st Cir. 2020): Admission is harmless when the challenged hearsay is cumulative of other properly admitted evidence.
  • United States v. Castellini, 392 F.3d 35 (1st Cir. 2004) and United States v. Manon, 608 F.3d 126 (1st Cir. 2010): “Overwhelming” evidence defeats prejudice; no reasonable probability of a different outcome.

3) “In furtherance” illustrations used to validate statements

  • United States v. Pérez-Vásquez, 6 F.4th 180 (1st Cir. 2021) and United States v. Flemmi, 402 F.3d 79 (1st Cir. 2005): Statements keeping members abreast of “current developments and problems” qualify as in furtherance.
  • United States v. Martinez-Medina, 279 F.3d 105 (1st Cir. 2002) and United States v. Sepulveda, 15 F.3d 1161 (1st Cir. 1993): Operational updates and role identification can further a conspiracy; Sepulveda also frames cumulative error.
  • United States v. Laureano-Pérez, 797 F.3d 45 (1st Cir. 2015): Statements promoting loyalty/compliance with group rules further the conspiracy.
  • United States v. Colón-Díaz, 521 F.3d 29 (1st Cir. 2008): “Vouching” for drug quality can further the goal of drug distribution.

4) Extrinsic evidence and intercepted calls

  • United States v. Mitchell, 596 F.3d 18 (1st Cir. 2010): Recordings of phone calls can supply extrinsic evidence of conspiracy membership.
  • United States v. Ruiz, 999 F.3d 742 (1st Cir. 2021): Out-of-court statements that qualify as nonhearsay under the Rules can constitute “extrinsic evidence” for Petrozziello purposes.
  • United States v. Avilés-Colón, 536 F.3d 1 (1st Cir. 2008): Used to reject Petrozziello attacks where testimony was based on personal experience (no hearsay at all).

5) Waiver/forfeiture and plain-error enforcement

  • United States v. Ortiz, 966 F.2d 707 (1st Cir. 1992): Unraised issues trigger plain-error review.
  • United States v. Benjamin-Hernandez, 49 F.4th 580 (1st Cir. 2022): Failure to argue plain error results in waiver of an unpreserved claim on appeal.
  • United States v. Pena, 24 F.4th 46 (1st Cir. 2022); United States v. Morales-Vélez, 100 F.4th 334 (1st Cir. 2024); United States v. Rodriguez-Monserrate, 22 F.4th 35 (1st Cir. 2021): The court enforced the requirement that appellants actually develop a plain-error argument, especially when challenges were not preserved in the remand process.

6) RICO enterprise proof context

  • Boyle v. United States, 556 U.S. 938 (2009): Invoked by Quiñones to argue “structure” proof; the First Circuit found any arguable error harmless because ample other evidence showed rules, hierarchy, meetings, and enforcement.
  • United States v. Rodríguez-Torres, 939 F.3d 16 (1st Cir. 2019): Used to illustrate evidence sufficient to satisfy Boyle’s “enterprise” requirements.

7) Cumulative error and related doctrines

  • United States v. Sepulveda, 15 F.3d 1161 (1st Cir. 1993): Multiple errors can aggregate to deny a fair trial even if each is individually insufficient—this is the framework Millán invoked, but could not satisfy given the remaining evidence.
  • United States v. Pérez-Montañez, 202 F.3d 434 (1st Cir. 2000): Reinforces that without underlying errors, there is no cumulative effect to assess.

B. Legal Reasoning

1) The court’s practical approach after remand: merits/harmlessness first

The panel declined to resolve threshold disputes about whether objections were properly preserved at trial or whether each statement had been specifically listed in opening briefs, because it could reject the Petrozziello challenges on clearer grounds: (i) deference to the District Court’s findings under clear-error review, and (ii) harmless error given the volume of unchallenged inculpatory proof. This is an explicit application of the “affirm on any ground apparent from the record” principle (Segrain v. Duffy; United States v. Barone) combined with harmless-error doctrine (United States v. Piper).

2) “In furtherance” is read functionally: operations, compliance, disputes, and quality assurance

The court treated as “in furtherance” a broad set of statements that: (a) conveyed operational updates (drug accounting, priorities, debts); (b) managed internal disputes (incentive nonpayment, discipline); (c) reinforced compliance and loyalty; or (d) supported sales by vouching for quality. The court tied these categories to its established precedent, particularly United States v. Pérez-Vásquez, United States v. Flemmi, United States v. Martinez-Medina, and United States v. Laureano-Pérez.

3) Extrinsic evidence can be satisfied by other admissible trial proof, including call evidence

A recurring defense theme was that declarants were not proven conspirators. The court repeatedly pointed to trial testimony and intercepted-call evidence—often independent of the challenged statement—to corroborate membership (consistent with United States v. Ramos-Baez). It also emphasized that recordings can supply extrinsic evidence (United States v. Mitchell) and that statements qualifying as nonhearsay can count as extrinsic corroboration (United States v. Ruiz).

4) The court polices appellate procedure: plain error must be argued, not merely implied

When Quiñones (and, in part, Millán) raised statement-specific claims late—either not listed on remand or not developed until supplemental briefing—the court treated the challenges as forfeited and required a developed plain-error argument. Citing United States v. Benjamin-Hernandez and United States v. Rodriguez-Monserrate, it held that failing to meaningfully argue plain error waives the issue on appeal. This is a significant procedural lesson of the opinion: post-remand supplemental briefing is not a substitute for preservation, and “incorporation by reference” will not do the work of analyzing why an asserted error is “plain” after the remand findings exist.

5) Cumulative error: even assuming multiple Petrozziello errors, overwhelming evidence defeats prejudice

Millán’s cumulative-error claim was addressed in a manner that is unusually explicit: the court assumed arguendo that several statement categories were erroneously admitted, yet still found no reasonable probability of a different verdict. The court anchored this conclusion in the unchallenged evidence showing Millán’s leadership role, his operational control, and direct links to drug processes (including unchallenged witness testimony and calls where Millán discussed drug finances and enforcement). This use of “assume error but deny prejudice” mirrors the prejudice-focused logic in United States v. Manon and the “overwhelming evidence” framing in United States v. Castellini.

C. Impact

  • Post-remand Petrozziello litigation becomes more constrained. The opinion signals that even after a remand for findings, appellants must identify challenged statements clearly and preserve them; otherwise, they face strict plain-error enforcement and waiver for failing to argue the standard.
  • Harmless-error analysis will do heavy lifting in large conspiracy trials. Where the record contains substantial unchallenged evidence (cooperating witnesses, intercepted calls, organizational records), the First Circuit is prepared to treat many hearsay disputes as non-outcome-determinative, especially when the statements are cumulative.
  • “In furtherance” remains broad and pragmatic. Operational updates, enforcement of group norms, quality “vouching,” and internal dispute management are repeatedly validated as furthering the conspiracy—important for RICO/drug cases built on institutional communications.
  • Cumulative error remains available in principle but difficult in practice. The court reaffirmed United States v. Sepulveda, yet demonstrated that cumulative error will fail where admissible evidence is overwhelming and the challenged statements add little beyond what the jury properly heard.

4. Complex Concepts Simplified

  • Hearsay: An out-of-court statement offered for its truth, generally inadmissible unless an exception/exclusion applies.
  • Rule 801(d)(2)(E) / Petrozziello: A coconspirator’s statement is treated as “not hearsay” if the government proves (by a preponderance) that (i) a conspiracy existed, (ii) both declarant and defendant were members, and (iii) the statement was made during and in furtherance of that conspiracy.
  • “In furtherance”: Not limited to giving orders; it can include updates, coordination, reassurance, discipline/enforcement, or sales promotion that helps the conspiracy function.
  • Extrinsic evidence: Independent proof of membership beyond the statement itself—e.g., witness testimony about joint conduct, intercepted calls, or other admissible facts.
  • Harmless error: Even if a court erred in admitting evidence, the conviction stands if the error likely did not affect the verdict (often because the same point was proven elsewhere or the remaining evidence was overwhelming).
  • Forfeiture vs. waiver: Forfeiture is a failure to preserve, typically leading to plain-error review; waiver can occur when a party fails to argue the applicable standard (here, plain error) on appeal.
  • Cumulative error: Multiple small errors can add up to unfairness; but if the admissible evidence is strong enough, the aggregate still may not create prejudice.

5. Conclusion

United States v. Quinones-Santiago reinforces three practical rules for conspiracy/RICO trials in the First Circuit: (1) Petrozziello admissibility is reviewed deferentially and applied functionally to statements that help a conspiracy operate; (2) many statement-specific disputes will be resolved through harmless-error analysis when the record contains extensive independent proof; and (3) appellants must preserve and litigate evidentiary issues with procedural precision—especially post-remand—because failure to develop a plain-error argument can itself be fatal.