Coconspirator Statements and Cumulative Error: Record-Supported Admission and Overwhelming Independent Evidence Sustain Conspiracy Convictions

1. Introduction

This decision concludes the remaining evidentiary challenges in consolidated appeals arising from a federal prosecution involving La Asociación Ñeta, commonly called La Ñeta. Originally formed to advocate for prisoners’ rights in Puerto Rico, the organization allegedly developed a criminal operation involving drug trafficking and violence within the prison system.

The appellants—Luis H. Quiñones-Santiago, Eduardo Rosario-Orangel, and Avelino Millán-Machuca—were each convicted of conspiracy under the Racketeer Influenced and Corrupt Organizations Act, 18 U.S.C. § 1962(d), and conspiracy to possess controlled substances with intent to distribute, 21 U.S.C. § 846. The United States defended those convictions on appeal.

The central question was whether statements attributed to other alleged participants had been properly admitted under Federal Rule of Evidence 801(d)(2)(E), which addresses statements made by a defendant’s coconspirator during and in furtherance of a conspiracy. The court also considered whether multiple possible evidentiary errors, assessed together, undermined Millán’s convictions.

The opinion principally applies and clarifies existing law rather than announcing a new hearsay exception. Its significance lies in its integrated approach: evaluate challenged statements individually, distinguish actual hearsay from firsthand testimony, identify corroborating evidence of participation, and assess any remaining assumed errors both individually and cumulatively.

2. Background and Procedural History

The charged conspiracies

The investigation resulted in charges against fifty defendants. The indictment identified La Ñeta as the RICO enterprise and alleged that its members and associates engaged in drug distribution and violence, including murder. The appellants allegedly agreed to facilitate the organization’s racketeering activities involving cocaine, heroin, and marijuana.

The separate drug-conspiracy count alleged an agreement to possess with intent to distribute more than one kilogram of a substance containing heroin, more than five kilograms of a substance containing cocaine, and more than one hundred kilograms of a substance containing marijuana. The present opinion concerns the convictions, not a new determination of sentencing consequences.

The earlier appeal and limited remand

Following a joint jury trial, all three appellants were convicted on both counts. Their appeals were consolidated with those of three codefendants. In United States v. Ramos-Baez, 86 F.4th 28 (1st Cir. 2023), the First Circuit rejected the other challenges relevant here but could not resolve certain coconspirator-statement objections because the district court had not made essential admissibility findings.

The First Circuit therefore retained appellate jurisdiction and remanded for findings under United States v. Petrozziello, 548 F.2d 20 (1st Cir. 1977). Millán’s cumulative-error challenge was dismissed without prejudice because the forthcoming findings could affect its resolution.

On remand, the defendants collectively identified dozens of statements requiring consideration. Although the government did not submit a response because of a reported calendar oversight, the district court held a hearing and found, by a preponderance of the evidence, that:

• The declarants and defendants belonged to the same conspiracy when the statements were made;
• The statements furthered that conspiracy; and
• Ample evidence outside the statements corroborated the defendants’ involvement.

The findings were collective rather than statement-by-statement. On the renewed appeal, however, the defendants did not argue that the district court had omitted findings concerning particular statements. They treated the findings as encompassing the identified statements and challenged their evidentiary support. That limitation matters: the First Circuit did not announce that generalized findings are sufficient in every case.

3. Summary of the Decision

The First Circuit affirmed all three appellants’ convictions. Its reasoning rested on several distinct grounds:

1. Supported coconspirator findings: For numerous statements, evidence outside the challenged statement established the declarant’s participation, while the statement’s context showed a purpose of advancing the conspiracy.
2. No hearsay at the threshold: Some testimony described the witness’s own participation or observations rather than an out-of-court assertion.
3. Harmless assumed errors: Other statements duplicated admissible or unchallenged evidence, making their exclusion immaterial to the outcome.
4. Failure to develop plain-error review: One of Quiñones’s challenges failed because he did not argue the applicable standard for an unpreserved objection.
5. No cumulative prejudice: Even assuming multiple errors in admitting statements against Millán, the remaining evidence overwhelmingly established his knowing agreement to facilitate the charged criminal activities.

The operative principle: Multiple assumed coconspirator-statement errors do not require reversal merely because they are numerous. Their combined effect must be measured against the remaining trial record. Here, that record independently and overwhelmingly established the necessary criminal agreement.

4. Governing Legal Framework

Coconspirator statements under Rule 801(d)(2)(E)

Under United States v. Petrozziello, the proponent must establish by a preponderance of the evidence that the challenged statement was made by a coconspirator during and in furtherance of the relevant conspiracy. The declarant’s membership cannot rest solely on the statement itself; corroborating evidence is required.

Although often described as a hearsay exception, Rule 801(d)(2)(E) technically classifies qualifying statements as not hearsay. The practical consequence is that an otherwise objectionable out-of-court assertion may be admitted against a defendant when the rule’s conditions are satisfied.

Those conditions remain separate. A declarant’s association with La Ñeta does not, without more, establish participation in its criminal conspiracy. Nor does a statement qualify simply because it concerns criminal conduct. It must have been made while the relevant conspiracy existed and must serve a purpose that advances it.

Review and alternative grounds for affirmance

Preserved challenges to the district court’s Petrozziello findings receive clear-error review. The appellate court therefore does not replace a supported factual inference with another merely because both are possible.

The court also may affirm an evidentiary ruling on another ground apparent from the record. Thus, even where the district court relied on the coconspirator rule, the appellate court could affirm because the testimony was firsthand rather than hearsay, or because any admission error was harmless.

Preservation issues were mostly left unresolved

The government argued that many challenges were unavailable because the defendants had not contemporaneously objected at trial or specifically identified the statements in their opening appellate briefs. The First Circuit generally bypassed those disputes because the challenges failed even under the more favorable merits analysis.

This approach did not abolish preservation requirements. The court separately applied them to a newly raised challenge by Quiñones, demonstrating that a decision to bypass a threshold dispute in one part of an appeal does not guarantee merits review of every objection.

5. Application to the Individual Appellants

A. Quiñones: organizational finances, historical statements, and an undeveloped challenge

Jowy’s statements about unpaid drug incentives

Quiñones challenged statements describing disagreements over his failure to remit drug “incentives”—payments owed to La Ñeta for permission to sell drugs individually. He argued that the statements concerned personal dealing rather than a shared conspiracy.

The court rejected that characterization. A witness independently testified that he had worked drugs with Jowy on La Ñeta’s behalf. Moreover, the disputed statements concerned compliance with La Ñeta’s payment requirements. Their organizational financial significance supported the finding that they advanced the conspiracy by keeping participants informed about a problem affecting it.

The important distinction is between a member’s personal profit and the organization’s financial interests. An individually operated drug business could still implicate the charged conspiracy when it generated required payments to the enterprise.

The Elders’ descriptions of La Ñeta

Quiñones also challenged statements by older members teaching new inmates about La Ñeta’s history and structure. Questions existed about whether the speakers participated in the charged conspiracy and whether their statements fell within its timeframe.

The court did not resolve those admissibility questions. Instead, it held that any error was harmless because witnesses independently described meetings, hierarchy, rules, and punishment practices from personal experience. The statements therefore were not indispensable proof that a RICO enterprise existed.

This was not an endorsement of the government’s suggestion that La Ñeta membership alone established participation in the criminal conspiracy.

The alleged transaction involving Millán

Quiñones argued that testimony about a transaction involving him and Millán necessarily depended on an unidentified declarant. But he had not identified the testimony in his opening appellate brief or his submission on remand.

At most, plain-error review was available. Because his briefs did not mention that standard or explain how he satisfied it, the court deemed any argument for relief under that standard waived. His renewed cumulative-error theory also failed because the court had assumed error concerning only one challenged category, leaving no combination of errors to aggregate.

B. Rosario: corroborated participation and duplicative evidence

Boringo’s assurances about drug quality

Ruiz testified that Boringo supplied drugs for sale and said that the drugs were good and that he had distributed some to Rosario and others. Independent testimony established that Ruiz sold drugs for Boringo and that Boringo paid La Ñeta in connection with those sales.

This evidence corroborated Boringo’s participation in the conspiracy. The context also supported the inference that he was vouching for the drugs’ quality to facilitate their sale, rather than merely recounting past events. The admission therefore survived clear-error review.

Statements attributed to Dianis Negrón

Rosario challenged testimony that Ruiz knew of him through conversations with Negrón. The government disputed whether the testimony contained hearsay at all.

The court assumed the objection could be valid but found any error harmless. Ruiz also identified other sources through whom he knew of Rosario, and the separate, properly admitted statement from Boringo remained in evidence. Removing Negrón’s contribution would not eliminate Ruiz’s testimony about Rosario.

Quintana’s identification of Rosario as a supplier

Álvarez recounted information that Rosario supplied drugs to Quintana. The court again resolved the challenge through harmlessness rather than deciding whether the coconspirator rule was satisfied.

Materially similar information from another individual, Chuito Carolina, was unchallenged. González also testified, without a corresponding challenge, that Rosario acknowledged possessing drugs sold on La Ñeta’s behalf. Together with Boringo’s admissible statement, this evidence made the challenged supplier identification cumulative.

C. Millán: leadership, criminal agreement, and multiple evidentiary routes

Millán’s position was more extensive. He did not dispute his leadership role in La Ñeta but argued that the properly admitted evidence showed only legitimate prisoner advocacy. He maintained that the challenged statements improperly transformed lawful leadership into control of a criminal organization.

The court did not treat leadership alone as proof of guilt. Instead, it identified substantial evidence connecting his leadership to drugs, finances, reporting obligations, discipline, and the management of consequences arising from criminal acts.

One particularly important point concerned Omi’s participation. Corroborating evidence included another admissible coconspirator statement about his role in smuggling cell phones. The court thus recognized that evidence “extrinsic” to the challenged statement need not consist exclusively of live testimony or firsthand observation. Another independently admissible statement can qualify.

6. Precedents Cited and Their Influence

A. The substantive conspiracy and enterprise requirements

United States v. Millán-Machuca, 991 F.3d 7 (1st Cir. 2021)

This earlier decision supplied the description of a RICO pattern: at least two related racketeering acts occurring within ten years and posing a threat of continued criminal activity. It framed the nature of the criminal enterprise alleged here, rather than resolving the present evidentiary disputes.

United States v. Ramos-Baez, 86 F.4th 28 (1st Cir. 2023)

This was the principal procedural and substantive foundation. It explained the earlier disposition, required corroboration of a declarant’s conspiracy membership, and established why further findings were necessary. It also supplied the formulation that defendants must know about and agree to facilitate the enterprise’s affairs through at least two racketeering acts. That agreement requirement was central to the harmlessness analysis: personal drug selling was not an indispensable fact.

Boyle v. United States, 556 U.S. 938 (2009)

Quiñones invoked this Supreme Court decision to argue that the Elders’ statements supplied essential proof of enterprise structure. The First Circuit answered the argument factually: independent evidence already established an organized entity with meetings, hierarchy, and enforceable rules. It did not need to decide whether the Elders’ statements independently met the evidentiary rule.

United States v. Rodríguez-Torres, 939 F.3d 16 (1st Cir. 2019)

This decision illustrated organizational evidence exceeding Boyle v. United States’s requirements, including meetings, rules, a loose hierarchy, and businesslike rewards for loyalty and performance. It supported the conclusion that excluding the Elders’ statements would not undermine proof of La Ñeta’s enterprise structure.

United States v. Leoner-Aguirre, 939 F.3d 310 (1st Cir. 2019)

Quoted through the earlier consolidated appeal, this case reinforced the importance of knowing agreement to facilitate the enterprise’s racketeering activities. It helped explain why independent evidence of Millán’s management and coordination mattered more than disputed assertions about particular personal sales.

B. The foundation for admitting coconspirator statements

United States v. Petrozziello, 548 F.2d 20 (1st Cir. 1977)

This controlling First Circuit precedent supplied the preponderance standard and the requirement that a coconspirator’s statement be made during and in furtherance of the conspiracy. The remand existed to obtain the findings necessary to apply that framework.

Anderson v. United States, 417 U.S. 211 (1974)

The Supreme Court’s agency explanation supplied the rule’s rationale: conspirators are treated as partners in crime and agents of one another. Just as an agent’s declaration binds a principal only within the relevant authority, a conspirator’s declaration must further the conspiracy before it can be used against a partner. This rationale limits the rule; it does not authorize admission of everything a participant says.

United States v. Machor, 879 F.2d 945 (1st Cir. 1989)

This decision informed the earlier refusal to treat missing findings as harmless. Because the original record did not make satisfaction of the preponderance standard apparent, the court required a remand rather than supplying an unsupported admissibility determination itself.

United States v. Rodríguez, 162 F.3d 135 (1st Cir. 1998)

This case recognized violence against a suspected informant as relevant evidence of conspiracy membership. It supported reliance on Sandwich’s threat against a supposed “snitch” as corroboration independent of his challenged statement.

United States v. Mitchell, 596 F.3d 18 (1st Cir. 2010), and United States v. Ruiz, 999 F.3d 742 (1st Cir. 2021)

These decisions explain what corroborating evidence may include. The former recognizes admissible recorded telephone statements as evidence of participation; the latter confirms that statements qualifying as nonhearsay under the federal rules can constitute extrinsic evidence. Together, they supported the foundation for admitting Omi’s statement without relying solely on that statement itself.

C. What it means to act “in furtherance”

United States v. Pérez-Vásquez, 6 F.4th 180 (1st Cir. 2021), and United States v. Flemmi, 402 F.3d 79 (1st Cir. 2005)

These authorities establish that keeping coconspirators informed of current developments and problems can advance a conspiracy. They supported admission of statements about unpaid incentives, internal disagreements, collection efforts, and operational difficulties. The rule encompasses coordination and problem-solving, not merely commands to commit an offense.

United States v. Jefferson, 215 F.3d 820 (8th Cir. 2000)

Cited through United States v. Flemmi, this decision supplied the formulation concerning information about “problems facing the group.” Its role was supporting the established operational-update principle, not providing a separate test.

United States v. Martinez-Medina, 279 F.3d 105 (1st Cir. 2002)

Statements conveying information about drug-conspiracy operations further the conspiracy. This principle applied to instructions concerning drug accounting and communications explaining members’ assigned responsibilities.

United States v. Colón-Díaz, 521 F.3d 29 (1st Cir. 2008)

This precedent treated assurances about drug quality as advancing sales by generating confidence. It provided the analogy for Boringo’s statement that his drugs were good and had been supplied to Rosario and others.

United States v. Laureano-Pérez, 797 F.3d 45 (1st Cir. 2015)

Statements encouraging loyalty or compliance with organizational rules may further a conspiracy. This authority supported admitting communications about discipline, documentation of violations, and the enforcement of incentive-payment obligations.

United States v. Ciresi, 697 F.3d 19 (1st Cir. 2012)

This case performed two functions. It supplied clear-error review for preserved Petrozziello challenges and recognized that statements intended to forestall internal dissension can further a conspiracy. Both propositions supported deference to the district court’s context-based findings.

United States v. Sepulveda, 15 F.3d 1161 (1st Cir. 1993)

For admissibility, this decision supported treating statements identifying members’ roles and activities as furthering the conspiracy. Separately, it supplied the cumulative-error principle discussed below: several errors may together have a more debilitating effect than any one alone.

D. Firsthand testimony and alternative grounds for affirmance

United States v. Avilés-Colón, 536 F.3d 1 (1st Cir. 2008)

This decision supported distinguishing firsthand testimony from hearsay. Cruz’s account of his own intermediary role did not become hearsay merely because it concerned a transaction involving others. The decision also supported treating updates on conspirators’ activities as furthering an ongoing operation.

Segrain v. Duffy, 118 F.4th 45 (1st Cir. 2024), and United States v. Barone, 114 F.3d 1284 (1st Cir. 1997)

These cases authorize affirmance on a ground apparent from the record, with the latter applying that principle specifically to evidentiary rulings. They allowed the court to uphold admission for reasons independent of the district court’s coconspirator analysis, including the absence of hearsay.

United States v. Piper, 298 F.3d 47 (1st Cir. 2002)

This authority supported resolving a Petrozziello-based challenge through harmless-error analysis without deciding whether the admission itself was erroneous. That method was used repeatedly, but the court separately considered its implications for cumulative error.

E. Preservation and harmlessness

United States v. Ortiz, 966 F.2d 707 (1st Cir. 1992), and United States v. Benjamin-Hernandez, 49 F.4th 580 (1st Cir. 2022)

The former supplied plain-error review for an unpreserved challenge. The latter established the consequence of failing to develop any argument under that demanding standard. Together, they defeated Quiñones’s newly raised challenge concerning the alleged transaction with Millán.

United States v. Valdivia, 680 F.3d 33 (1st Cir. 2012)

This was the opinion’s recurring harmlessness authority. When challenged testimony duplicated other evidence, its admission did not warrant reversal. The court repeatedly identified the particular overlapping evidence rather than relying only on a general assertion that the prosecution’s case was strong.

United States v. Veloz, 948 F.3d 418 (1st Cir. 2020)

This decision similarly supported harmlessness where another coconspirator had already testified to the same effect. It reinforced the treatment of the challenged statement identifying Rosario as a drug supplier.

United States v. Henderson, 911 F.3d 32 (1st Cir. 2018)

This case highlighted the significance of failing to answer a harmlessness argument. It supported rejecting certain challenges where Millán did not explain how the specific statements prejudiced him, especially given the substantial independent evidence.

F. Cumulative error, disclosure, and proof of agreement

United States v. Pérez-Montañez, 202 F.3d 434 (1st Cir. 2000)

This decision supplied the principle that there is no cumulative effect to assess when the predicate claims establish no collection of errors. It explained the rejection of Quiñones’s cumulative-error argument, distinct from Millán’s claim involving several assumed errors.

United States v. Castellini, 392 F.3d 35 (1st Cir. 2004)

The court relied on this authority in assessing the significance of overwhelming remaining evidence. It supported rejecting cumulative prejudice where the independent proof of knowing participation remained exceptionally strong.

United States v. Manon, 608 F.3d 126 (1st Cir. 2010)

This decision supplied the concluding outcome-focused formulation: there was no reasonable probability that exclusion of the statements would have altered the trial’s result. It tied the aggregate analysis to the verdict rather than to the mere number of disputed admissions.

United States v. Acevedo-Hernández, 898 F.3d 150 (1st Cir. 2018)

This precedent recognizes that knowing and voluntary participation may be proved circumstantially through acts advancing a conspiracy. It supported drawing an agreement inference from Millán’s management of drug-related matters and his response to concerns arising from an organization-directed murder.

United States v. Rodríguez-Reyes, 714 F.3d 1 (1st Cir. 2013), and United States v. Negrón-Sostre, 790 F.3d 295 (1st Cir. 2015)

The former recognizes coordinated protection of a group’s status as evidence of agreement; the latter recognizes sustained interaction as circumstantial evidence of association with a venture. They reinforced the inference drawn from Millán’s continuing coordination with other leaders and participants, considered alongside direct evidence of criminal activity.

Brady v. Maryland, 373 U.S. 83 (1963), and Giglio v. United States, 405 U.S. 150 (1972)

These decisions appeared in connection with disclosure challenges addressed in the earlier appeal. The present opinion’s material discussion concerned Giglio v. United States: prejudice or materiality is part of establishing the violation itself. Earlier findings of no prejudice therefore meant no disclosure violation had been established, not that an established violation was merely harmless. Millán gave the court no sufficient reason to revisit those conclusions after remand.

G. Naming conventions

United States v. Rosa-Borges, 101 F.4th 66 (1st Cir. 2024), and Caz v. Garland, 84 F.4th 22 (1st Cir. 2023), supported the court’s use of the appellants’ first surnames in accordance with Spanish naming customs. These citations had no substantive influence on the evidentiary holdings.

7. Why Millán’s Cumulative-Error Claim Failed

The court did not confuse individual harmlessness with aggregate harmlessness

The most important analytical step came after the statement-by-statement review. A series of individually harmless errors can sometimes undermine a trial when combined. Accordingly, the court did not simply count its earlier harmlessness rulings and declare the matter closed.

Instead, it assumed that the unresolved admissions were erroneous and assessed their combined effect. These included statements concerning organizational structure, personal trafficking, appointments and reports, the extent of Millán’s knowledge, leadership directives, restrictions on drug sales, and reactions to information supplied to him.

The court concluded that it did not need to decide whether each assumed error actually occurred because the cumulative claim failed even on that assumption.

The independent evidence addressed the disputed issue directly

The remaining evidence did more than establish that La Ñeta existed or that Millán held a title. It connected him to the organization’s criminal operation:

• González described daily drug sales and other racketeering acts he personally witnessed or committed.
• He described processing drugs that Jowy identified, in an admissible statement, as supplied by Millán.
• He recounted direct conversations with Millán concerning drug distribution and a murder ordered by another La Ñeta leader.
• Millán reassured González that the other leader had authority to order the murder and offered to address objections arising from it.
• Intercepted calls documented Millán’s involvement in drug debts, reporting requirements, disciplinary measures, and organizational finances.
• Cruz and Ruiz separately described working directly with Millán in drug trafficking.

This evidence answered Millán’s central defense that his activities reflected only lawful prisoner advocacy. It supported a finding that he knowingly facilitated criminal conduct, even without the challenged statements.

The disclosure claims did not enlarge the pool of errors

Millán also sought to connect the evidentiary issues to previously rejected disclosure objections concerning Cruz and Ruiz. The court declined to reopen them. Because the earlier absence of material prejudice meant that no Giglio violation had been established, those objections were not additional proven errors awaiting aggregation.

The opinion nevertheless left the analysis fact-sensitive: the court considered whether the post-remand issues supplied a reason to revisit the earlier conclusions and found that Millán had not demonstrated one.

8. Significance and Potential Impact

Operational communications remain within the coconspirator rule

The decision reinforces that statements advancing a conspiracy include financial updates, assignments, reporting requirements, warnings, and efforts to preserve internal discipline. A conspiracy often functions through administration as much as through the immediate commission of offenses.

That principle is especially relevant to enterprise prosecutions involving layered leadership. Its limit is equally important: the statement’s actual context must connect it to the criminal agreement. Organizational membership and conversation about the group are not automatic substitutes for the rule’s requirements.

Corroboration may come from other admissible communications

Future cases may rely on this opinion’s recognition that another properly admitted coconspirator statement can corroborate a declarant’s participation. “Extrinsic” means outside the challenged statement, not necessarily outside all recorded conversations. Courts must still avoid using the challenged assertion as its own sole foundation.

Appellate review can separate admissibility from outcome

The opinion illustrates several legitimate routes to affirmance. An appellate court may find supported admission, identify firsthand testimony, or assume an evidentiary defect and assess harmlessness. The resulting judgment does not necessarily establish that every disputed statement was admissible.

That distinction is essential when citing this decision. Its harmlessness holdings should not be converted into categorical approval of unidentified speakers’ statements or communications outside a charged conspiracy’s timeframe.

Cumulative-error review requires an evidence-specific account

The decision offers a model for aggregate review: identify the potentially erroneous material, set it aside, and explain what the remaining evidence proves about the disputed elements. Its force lies in that evidentiary comparison, not in a rule that strong prosecution cases always defeat cumulative-error claims.

Practical lessons for litigants

• For prosecutors: Establish a distinct foundation for each declarant and explain how the statement advances the criminal agreement.
• For defense counsel: Preserve specific objections, identify the relevant statements throughout the appeal and remand, and develop plain-error arguments when necessary.
• For both sides: Address prejudice concretely by explaining whether the statement adds something genuinely different from the remaining evidence.
• For trial courts: Clear, statement-specific findings can prevent uncertainty, although the adequacy of generalized findings was not independently challenged here.

9. Complex Concepts Simplified

RICO enterprise

The organization whose affairs are allegedly conducted through recurring criminal activity. Proving that an organization exists is different from proving that a particular defendant agreed to further its criminal operations.

Conspiracy

A criminal agreement. The prosecution need not prove that every participant personally performed each underlying criminal act, but it must prove the required knowing participation in the agreement.

Declarant and witness

The declarant originally made the out-of-court statement; the witness may later repeat it at trial. For the coconspirator rule, the original speaker’s participation matters. The witness’s willingness to testify does not itself establish the original speaker’s membership.

During and in furtherance

The statement must occur while the relevant conspiracy exists and help advance it. Instructions, useful updates, and efforts to maintain cooperation can qualify; a statement does not qualify merely because it mentions crime.

Preponderance of the evidence

The judge must find the admissibility facts more likely true than not. This is lower than the beyond-a-reasonable-doubt standard governing the jury’s determination of guilt.

Extrinsic evidence

Evidence beyond the particular statement offered for admission. It can include firsthand testimony and other independently admissible statements.

Clear error

A deferential review standard for factual findings. The appellate court does not overturn a supported finding simply because it could have drawn a different inference.

Harmless error and cumulative error

A harmless error does not justify reversal because it did not sufficiently affect the outcome. Cumulative-error review asks whether several errors, considered together, nevertheless undermined the trial.

Unchallenged evidence

Evidence not attacked through the objections under review. The opinion carefully refers to evidence as “properly admitted” or “unchallenged”; those descriptions are not interchangeable findings that every conceivable objection has been resolved.

10. Conclusion

The First Circuit affirmed all three appellants’ convictions by combining careful review of individual statements with a separate assessment of aggregate prejudice. Supported operational communications were admissible, firsthand accounts required no hearsay exception, and the remaining assumed errors did not undermine the verdicts.

The decision’s broader lesson is twofold: coconspirator admissibility requires a genuine evidentiary foundation, and cumulative-error review requires more than adding together disputed rulings. The decisive question is what the challenged material contributed when measured against the remaining proof of knowing criminal agreement.