FRAP 28 Requires Real, Accurate Authority: Pro Se and Generative-AI Use Do Not Excuse Fabricated or Misrepresented Citations (and § 636(c)(4) Cannot Reopen Final Judgments)

1. Introduction

Sifuentes v. Capital One (10th Cir. Feb. 6, 2026) is an appeal from the District of Utah’s denial of David Angel Sifuentes, III’s fourth post-judgment attempt to undo the dismissal of his civil case against Capital One. The underlying suit began in March 2022 and alleged that Capital One prescreened him for credit, then denied his application based on inaccurate information, harming his credit score and causing emotional distress. He pleaded federal and state theories, including the Fair Credit Reporting Act (FCRA) and emotional-distress claims.

After Sifuentes ultimately consented to magistrate-judge jurisdiction under 28 U.S.C. § 636(c) and filed an amended complaint, the magistrate judge dismissed the federal claims with prejudice for failure to state a claim and dismissed the state claims without prejudice after declining supplemental jurisdiction. Sifuentes pursued repeated post-judgment motions, culminating in a fourth motion seeking to withdraw consent and vacate judgment on constitutional theories. The district court denied the motion, warning that continued meritless filings could lead to filing restrictions.

On appeal, Sifuentes argued mainly that the magistrate judge lacked “subject-matter jurisdiction” to deny his motion; that the order was void; and that the district court mischaracterized his request as a Rule 60 motion rather than a request under 28 U.S.C. § 636(c)(4). The Tenth Circuit affirmed.

2. Summary of the Opinion

  • The Tenth Circuit affirmed the denial of Sifuentes’ fourth post-judgment motion.
  • The court rejected his jurisdictional/statutory arguments as unsupported and, critically, noted that his brief relied on apparently nonexistent and misquoted authorities, violating Federal Rule of Appellate Procedure 28(a)(8)(A).
  • The court emphasized that neither pro se status nor use of generative artificial intelligence excuses FRAP 28 violations.
  • The court held that 28 U.S.C. § 636(c)(4) does not provide a procedural mechanism to disturb a final judgment; the proper vehicle is Rule 60, and the district court properly declined to reach the merits given the successive nature of the motion.
  • The court added that, even on the merits, “extraordinary circumstances” were not shown; regret after losing is not extraordinary.
  • The panel also found no abuse in the district court’s warning about possible filing restrictions, noting no reviewable restriction had yet been imposed and that repeated meritless filings justified a warning.

3. Analysis

A. Precedents Cited

1) Standards of review and pro se treatment

  • United States v. Buck, 281 F.3d 1336, 1344 (10th Cir. 2002): The panel cited this for the applicable review standard for a Rule 60 ruling (the opinion states “de novo”). Practically, the citation anchors the appellate lens: the question is whether the district court properly denied Rule 60 relief, not whether the underlying dismissal should be re-litigated.
  • Hall v. Bellmon, 935 F.2d 1106, 1110 (10th Cir. 1991): The court invoked the familiar rule that pro se filings are construed under a “less stringent standard,” but the court will not “assume the role of [his] advocate.” This frames the rest of the opinion: latitude in construction does not mean the court will supply missing law, fix defective arguments, or excuse rule violations.

2) Adequate briefing and the requirement of real legal authority (FRAP 28)

  • Davison v. Comm'r, No. 24-9000, 2025 WL 827693, at *3 (10th Cir. Mar. 17, 2025) (citing United States v. Banks, 451 F.3d 721, 728 (10th Cir. 2006)): These authorities support the proposition that an appellant must support arguments with legal authority. The Sifuentes panel used them as a gateway principle, then sharpened it: the authority must actually exist and must support the stated proposition.
  • Order to Show Cause, Amarsingh v. Frontier Airlines, Inc., No. 24-1391, slip op. at 8 (10th Cir. Sept. 5, 2025): The court treated this as a direct statement of circuit policy on briefing integrity: reliance on nonexistent cases or misrepresenting cases violates FRAP 28(a)(8)(A), and “Neither status as a pro se litigant nor the use of generative artificial intelligence excuses violations of this rule.”

    Doctrinal importance: Although the disposition is designated “not binding precedent,” the court’s explicit linkage of fabricated/misrepresented citations with FRAP 28 noncompliance—and its express reference to generative AI—signals a sharpened enforcement posture: inaccurate citation practices are not “harmless” pro se mistakes but can be treated as independently dispositive.
  • Garrett v. Selby Connor Maddux & Janer, 425 F.3d 836, 841 (10th Cir. 2005): This case reinforces that FRAP 28 applies equally to pro se litigants. The panel used it to foreclose any attempt to use pro se status as a shield against the rule’s baseline demands.
  • Moore v. City of Del City, No. 25-6002, 2025 WL 3471341, at *3 (10th Cir. Dec. 3, 2025): The panel cited this to underscore the consequence: even if Sifuentes had a “colorable legal argument,” the FRAP 28 failures could be “sufficient grounds to dismiss his case” on appeal.

3) The opinion’s treatment of purported authorities cited by the appellant

  • In re Search of a Nextel Cellular Telephone: The court stated that a search of legal databases indicated this cited case did not exist as described (a 2008 D.D.C. decision). The panel treated the citation as an example of apparently fabricated authority.
  • Sinclair v. Wainwright, 814 F.2d 1516 (11th Cir. 1987): The panel stated that language Sifuentes purported to quote “appears nowhere in Sinclair,” treating it as a misquotation or misuse. This matters because it demonstrates the court’s focus was not merely on weak authority, but on accuracy of quotations and propositions.

4) Prior iterations of this litigation

  • Sifuentes v. Capital One, No. 23-4088, 2023 WL 6060382 (10th Cir. Sept. 18, 2023): The panel referenced the prior appeal to show the dispute’s procedural posture and that diversity jurisdiction had not been adequately pleaded—helping explain why repeated attempts to revisit the merits were not properly before the court.
  • Sifuentes v. Capital One, No. 24-4034, 2024 WL 4362257 (10th Cir. Oct. 1, 2024): The panel referenced this second appeal (from denial of a prior post-judgment motion) to emphasize that arguments were not preserved and had already been rejected, supporting the district court’s treatment of the fourth motion as an improper successive attempt.

B. Legal Reasoning

1) Consent to magistrate jurisdiction and who may “vacate a reference”

Sifuentes sought to frame his filing as “jurisdictional,” contending that a magistrate judge cannot decide a motion challenging the magistrate’s authority. The panel rejected the argument as presented because it was unsupported by valid authority and because his reading of the statute was incorrect: the court noted that 28 U.S.C. § 636(c)(4) says “[t]he court” may “vacate a reference,” not “the district judge” as Sifuentes claimed.

Importantly, the panel added a limiting methodological point: it did “not rule out the possibility” that other authority might support some version of his argument, but because he failed to cite such authority, the appellate court would not construct it for him. This reflects the interaction of Hall v. Bellmon (no advocacy role) with FRAP 28 briefing requirements.

2) FRAP 28 enforcement as an independent basis to reject the appeal

The opinion’s central normative move is its treatment of fabricated/misused authority as a direct FRAP 28(a)(8)(A) problem. The panel did not merely say the arguments were unpersuasive; it treated the citations themselves as disqualifying defects in appellate advocacy. By invoking Order to Show Cause, Amarsingh v. Frontier Airlines, Inc., the court expressly stated that neither pro se status nor generative AI use excuses such violations, signaling that litigants bear responsibility for verifying citations and quotations.

3) Why § 636(c)(4) could not provide the relief sought after final judgment

On the third issue, Sifuentes claimed the district court erred by treating his request as a Rule 60 matter. The panel disagreed, reasoning that § 636(c)(4) “does not create a procedural mechanism to unseat a final judgment.” In other words, even if a “reference” could be vacated in some circumstances, that provision is not itself a post-judgment reopening device. The procedural vehicle to challenge a final civil judgment is Rule 60 (as the district court construed it).

4) Successive post-judgment motions and “extraordinary circumstances”

The district court denied the fourth motion because the arguments could have been raised earlier; the Tenth Circuit endorsed that approach. It also addressed (briefly but clearly) the merits: Sifuentes argued for withdrawal of consent based on “extraordinary circumstances,” but the panel found nothing extraordinary—he consented, lost on pleadings, failed to cure defects through amendment, then regretted the choice. The court characterized this as ordinary litigation disappointment, not an exceptional circumstance warranting reopening.

5) Filing-restriction warning

The panel rejected Sifuentes’ complaint about the district court’s “threat” of filing restrictions for two reasons: (i) there was no actual restriction imposed yet (thus little to review), and (ii) repeated attempts to revive non-meritorious claims can justify warnings as part of docket management.

C. Impact

  • Appellate briefing integrity: The decision reinforces (and publicizes) a stricter posture toward fabricated or inaccurate citations. Its explicit statement that “Neither status as a pro se litigant nor the use of generative artificial intelligence excuses” FRAP 28 violations will likely be cited to support summary affirmance/dismissal where briefs contain hallucinated authorities or mischaracterized holdings.
  • AI-assisted filings: While the court did not ban AI use, it effectively imposed a verification duty: parties remain responsible for ensuring cited cases exist and support the asserted propositions.
  • Magistrate-consent disputes after judgment: The panel’s reasoning clarifies that § 636(c)(4) is not a post-judgment escape hatch; attempts to undo final judgments must proceed under Rule 60 standards, with “extraordinary circumstances” not satisfied by mere regret or repeated losses.
  • Docket control: The approval of warnings about filing restrictions supports district courts’ incremental responses to serial, meritless post-judgment motions—especially after multiple appeals and repeated Rule 60 attempts.

4. Complex Concepts Simplified

28 U.S.C. § 636(c) consent to magistrate jurisdiction
Parties in a civil case may consent to have a magistrate judge conduct all proceedings, including entering final judgment. Consent reallocates who acts as the trial-level decisionmaker (magistrate judge rather than district judge), but it does not change the substantive law or the need to follow procedural rules.
28 U.S.C. § 636(c)(4) “vacate a reference”
This provision allows “the court” to withdraw the case from a magistrate judge even after consent. But, as the panel stressed, it is not automatically a tool to undo a final judgment already entered; it speaks to the assignment/reference, not to reopening final judgments.
Rule 60(b) motion for relief from judgment
Rule 60(b) is a narrow set of grounds to obtain relief from a final judgment (for example, certain mistakes, newly discovered evidence, fraud, or other extraordinary reasons). It is not a substitute for appeal, and repeated/successive Rule 60 motions raising arguments that could have been made earlier are commonly denied.
FRAP 28(a)(8)(A)
The rule requiring an appellant’s argument section to include contentions and reasons with citations to authorities and the record. The Sifuentes panel emphasized that citations must be accurate: invented cases and false quotations violate the rule.
“Not binding precedent”
The order and judgment states it is not binding precedent except under doctrines like law of the case, res judicata, and collateral estoppel. Even so, it may be cited for persuasive value, and its statements—especially regarding FRAP 28 compliance and AI—can influence future panels and litigants.

5. Conclusion

Sifuentes v. Capital One is a procedural, post-judgment decision with a clear message about appellate practice: litigants must present supported legal arguments grounded in real, accurately represented authority. The Tenth Circuit treated fabricated or misquoted citations as a serious FRAP 28(a)(8)(A) breach and stated plainly that neither pro se status nor generative AI use excuses it. Substantively, the court also clarified that 28 U.S.C. § 636(c)(4) is not a mechanism to unsettle final judgments; such efforts proceed, if at all, under Rule 60, and “extraordinary circumstances” do not include ordinary regret after repeated losses. The decision’s likely legacy is its practical enforcement signal: verify your citations (especially when using AI) or risk losing on briefing defects alone.