Preservation-First Criminal Appeals: Forfeiture of New Suppression Theories, CI Non-Disclosure, Contextual Texts as Non-Hearsay, and Plain-Error Limits on § 922(g)(1) Second Amendment Challenges

1. Introduction

United States v. Harry Duncan (3d Cir. June 10, 2026) is a nonprecedential Third Circuit decision affirming convictions for (i) possession with intent to distribute cocaine, cocaine base, and fentanyl under 21 U.S.C. § 841(a)(1), (b)(1)(C); (ii) felon-in-possession of firearms and ammunition under 18 U.S.C. § 922(g)(1); and (iii) aiding and abetting falsification of a firearms purchase form under 18 U.S.C. § 924(a)(1)(A), (2).

The case arose from an Allegheny County investigation using a confidential informant (“CI”) to execute controlled purchases, including a November 7, 2022 controlled buy that detectives observed. Police obtained a search warrant for Duncan’s residence (1622 Loretta Drive). During the search—before a Miranda warning—Duncan eventually stated to an officer that he alone lived there and everything inside was his. The search yielded drugs, firearms, ammunition, and trafficking paraphernalia, along with phones and other items tying Duncan to the premises and a vehicle linked to the controlled buy.

On appeal, Duncan attacked five key trial-court rulings: denial of suppression, denial of a Franks hearing, denial of CI disclosure/exclusion of CI-related testimony, admission of certain third-party text messages, and rejection of constitutional challenges to § 922(g)(1). The Third Circuit affirmed across the board, emphasizing issue preservation, the limited relevance of CI credibility when police independently observe controlled buys, harmless-error analysis for any Confrontation Clause problem, and the continued force of circuit precedent sustaining § 922(g)(1).

2. Summary of the Opinion

• Suppression: Duncan forfeited the specific suppression theory he pressed on appeal by failing to present the same factual basis in the district court; without “good cause” under Rule 12, the Third Circuit would not consider it. In any event, the panel indicated the statements were spontaneous/voluntary and not tainted in the manner Duncan claimed.
• Franks hearing: No Franks v. Delaware hearing was required because the probable cause rested substantially on controlled purchases that detectives witnessed—facts not dependent on the CI’s credibility.
• CI identity & CI testimony: Disclosure was not required under Roviaro v. United States because the CI primarily “validated” the search and was not essential to a fair determination; any Confrontation Clause issue from CI-related testimony was harmless in light of overwhelming independent evidence.
• Text messages: Incoming texts from unidentified third parties were properly admitted as non-hearsay when used to contextualize Duncan’s own statements, not for the truth of the messages.
• § 922(g)(1) challenges: The as-applied Second Amendment challenge failed under plain-error review, and the facial challenge was foreclosed by binding Third Circuit precedent; the vagueness challenge failed because Duncan did not argue vagueness as applied to his conduct.

3. Analysis

3.1 Precedents Cited (and How They Drive the Result)

A. Appellate posture and deference to the verdict

The panel framed the evidentiary review posture using United States v. Kolodesh (quoting United States v. Serafini): because the convictions followed a jury trial, the evidence is viewed in the light most favorable to the government. This baseline mattered most to the harmless-error and sufficiency-adjacent assessments: once the record contained extensive physical evidence from the search and testimony from non-CI witnesses, the CI-related disputes became less likely to affect the verdict.

B. Suppression: preservation doctrine and Rule 12

The court’s core suppression holding is procedural: Duncan did not preserve the specific factual argument he advanced on appeal. Relying on United States v. Sok and United States v. Joseph, the panel reiterated that litigants must preserve “specific arguments,” not merely “issues,” and that an appellate argument must depend on the same legal standard and the same facts presented below.

Because Duncan newly relied on video footage (and newly identified alleged interrogation questions) that he had not used to ground the district-court suppression motion, the Third Circuit applied United States v. Sok’s Rule 12 constraint: absent “good cause,” an unpreserved suppression argument cannot be considered. The panel also cited United States v. Rose for the principle that failure to show good cause bars consideration.

On the merits (in dicta), the panel referenced Miranda v. Arizona and then Oregon v. Elstad to signal why the statements would likely be admissible anyway: Elstad rejects an expansive “taint” theory from an initial failure to administer warnings where a subsequent statement is voluntary; admissibility turns on whether the statement was knowingly and voluntarily made. Here, Duncan’s statements were characterized as voluntary/spontaneous to a different officer after he initially ignored questions.

C. Franks: omissions about the CI and the “police observation” buffer

For the requested Franks hearing, the opinion applied Franks v. Delaware through United States v. Desu, which articulated the familiar two-part showing: (1) false statements made with reckless disregard for the truth, and (2) probable cause fails once the false material is excised (or, in omission cases, once the affidavit is “corrected”). The panel then relied heavily on United States v. Aviles: when the affidavit relays controlled-purchase facts that “depend upon police observation,” the CI’s credibility becomes less material because the judge’s probable-cause determination is not meaningfully affected by impeaching the CI.

The doctrinal move is significant: even if a defendant can identify CI credibility problems, the materiality prong is hard to satisfy where police surveillance independently corroborates the transaction that supports probable cause.

D. CI identity, due process, and the informant privilege

The panel addressed disclosure under Roviaro v. United States, which recognizes the government’s privilege to withhold an informant’s identity but requires disclosure where it is “relevant and helpful to the defense” or “essential to a fair determination.” Applying that balancing, the court found no abuse of discretion (standard from United States v. Johnson) because:

• the government did not charge Duncan for the controlled buy itself;
• detectives witnessed the controlled purchase referenced in the affidavit;
• the search (which yielded the key evidence) was executed without CI involvement; and
• the government’s proof included substantial non-CI evidence (physical evidence and non-CI witnesses).

The panel reinforced this with the en banc decision United States v. Bazzano, quoted for the idea that where an informant’s role is limited to “validating a search” (i.e., supplying probable cause), disclosure is generally not required, particularly when guilt is established primarily by evidence seized during the search.

In a footnote, the court acknowledged discovery regimes that can intersect with CI identity—Brady v. Maryland, Giglio v. United States, and Kyles v. Whitley—and also referenced Fed. R. Evid. 806 (impeaching a hearsay declarant). But it held Duncan offered no non-speculative basis that such obligations compelled disclosure here or were violated.

E. Confrontation Clause: testimonial hearsay, then harmless error

The Sixth Amendment analysis tracked Crawford v. Washington (testimonial hearsay inadmissible absent unavailability and prior opportunity to cross-examine). The panel assumed without deciding that Detective Bloom’s testimony included the CI’s testimonial hearsay. Even so, it invoked harmless-error doctrine under United States v. Jimenez (which cited United States v. Hinton) and applied the Third Circuit’s “highly probable” test from United States v. Lopez: an evidentiary constitutional error is harmless if it is highly probable it did not contribute to the verdict.

The court found harmlessness based on the breadth of independent evidence: drugs and guns recovered from the residence, communications about drug transactions, and testimony from a non-CI witness who admitted trading guns for drugs.

F. Hearsay and digital communications: contextual texts

The panel reviewed hearsay classification de novo under United States v. Sallins. It then applied United States v. Browne (quoting United States v. Hendricks) for a recurring principle in electronic-evidence cases: third-party messages can be admitted not for their truth, but to make the defendant’s own messages intelligible and recognizable as admissions. When used for context, they are non-hearsay.

G. § 922(g)(1): plain-error constraints and precedent foreclosure

The as-applied Second Amendment challenge failed under plain-error review because it was raised for the first time on appeal. The panel relied on United States v. Dorsey to set the standard: Duncan needed to show a “clear or obvious” error. He could not, as he identified no precedent establishing a Second Amendment right for a felon to possess a firearm while released on bond for state felony charges including terroristic threats.

The facial challenge was foreclosed by binding Third Circuit precedent recognizing constitutionally valid applications of § 922(g)(1), including United States v. Moore (supervised release context) and United States v. Quailes (state parole/probation context). The panel also rejected a void-for-vagueness theory under United States v. Harris because Duncan did not argue vagueness as applied to his conduct.

Finally, the opinion noted Duncan conceded his Commerce Clause argument was foreclosed by United States v. Singletary.

3.2 Legal Reasoning (How the Court Put the Pieces Together)

1. Procedural gatekeeping first: For suppression, the panel prioritized preservation and Rule 12’s limits. The practical message is that appellate courts will not reach the merits of a suppression theory if the defendant changed the factual predicate on appeal and cannot show “good cause.”
2. Materiality as the fulcrum in CI-based challenges: Both the Franks request and the Roviaro disclosure request faltered on materiality: where detectives observe the controlled buy and the prosecution’s trial proof rests on a later search and other witnesses, CI credibility and identity become legally peripheral.
3. Assume error, affirm anyway (harmlessness): For the Confrontation Clause claim, the panel took the path of least resistance—assuming (without deciding) “testimonial hearsay”—and then concluding the verdict did not depend on it. The “highly probable” standard provided a straightforward route to affirmance.
4. Function-based hearsay analysis: The text-message ruling turned on the evidentiary purpose: contextualizing the defendant’s admissions rather than proving the truth of the third party’s assertions.
5. Plain error and precedent control in constitutional challenges: For § 922(g)(1), the combination of plain-error review (as-applied) and binding precedent (facial) effectively resolved the claims without extended historical analysis in this nonprecedential opinion.

3.3 Impact

• Suppression practice in the Third Circuit: The decision underscores that a defendant must present not only the right legal theory (e.g., Miranda/custody/interrogation) but also the specific factual basis (including pinpointing questions, timing, and video-based details) in the district court. Holding back factual particulars for appeal risks Rule 12 forfeiture absent “good cause.”
• CI-related litigation: Where controlled buys are independently observed and the case is charged/proved mainly through a warranted search, defendants will face an uphill battle obtaining (i) a Franks hearing based on CI credibility omissions or (ii) Roviaro disclosure. The opinion functionally encourages defense counsel to develop concrete, non-speculative showings of how CI identity or impeachment would affect guilt, not merely probable cause.
• Confrontation Clause strategy: Even when CI statements come in through an officer, appellate relief may turn less on whether Crawford applies and more on whether the record contains strong, independent inculpatory evidence. The harmless-error framework can be dispositive.
• Digital evidence: The ruling confirms the prosecution’s ability to introduce third-party messages as contextual “bookends” to a defendant’s own statements—placing a premium on careful limiting instructions and Rule 403 arguments rather than categorical hearsay objections.
• § 922(g)(1) challenges after circuit precedent: In the Third Circuit, facial challenges remain foreclosed by decisions like United States v. Moore and United States v. Quailes, and as-applied claims raised late will face the steep “clear or obvious” hurdle identified in United States v. Dorsey.

4. Complex Concepts Simplified

Miranda / “custodial interrogation”

Miranda warnings are required before custodial interrogation. Even if police fail to warn, a later statement is not automatically excluded; under Oregon v. Elstad, voluntariness and a knowing waiver remain central, and the “taint” does not indefinitely persist from an earlier failure to warn.

Rule 12 forfeiture and “good cause”

Suppression arguments must be raised in the district court. If a defendant changes the argument’s factual basis on appeal, the appellate court generally will not consider it unless the defendant shows “good cause” for the failure to raise it earlier (as emphasized via United States v. Sok and United States v. Rose).

Franks hearing

A defendant is not entitled to a hearing merely by asserting an affidavit was misleading. Under Franks v. Delaware, the defendant must make a substantial showing of reckless falsity (or a material omission) and that, without the tainted material, probable cause fails.

Roviaro informant privilege

The government can usually keep an informant’s identity secret. Disclosure is required only if the identity is meaningfully important to the defense or to a fair trial (from Roviaro v. United States), not merely because an informant participated somewhere in the investigation.

Confrontation Clause and harmless error

Even if testimonial hearsay slips in (raising Crawford v. Washington concerns), an appellate court can affirm if it is “highly probable” the evidence did not affect the verdict (the approach applied via United States v. Jimenez and United States v. Lopez).

Non-hearsay “context” messages

A statement is hearsay only if offered for its truth. Messages from others can be admitted solely to make the defendant’s responses understandable (per United States v. Browne and United States v. Hendricks).

Plain-error review

Arguments raised for the first time on appeal face a demanding standard: the defendant must show a clear or obvious legal error. That standard proved fatal to Duncan’s as-applied § 922(g)(1) claim under United States v. Dorsey.

5. Conclusion

Although nonprecedential, United States v. Harry Duncan is a tightly reasoned application of several recurring criminal-appeal doctrines in the Third Circuit: (1) appellate courts enforce strict preservation rules for suppression theories; (2) CI credibility disputes often do not justify a Franks hearing or Roviaro disclosure when police observation and search-warrant evidence carry the case; (3) potential Confrontation Clause issues may be rendered non-dispositive by robust harmless-error analysis; and (4) third-party texts may be admitted as non-hearsay context, while § 922(g)(1) challenges remain constrained by plain-error review and binding circuit precedent.