Sanctionable Misconduct for “Hallucinated” Authorities in Appellate Briefing: Striking Defective Citations, Awarding Fees, and Referring Counsel for Discipline

1. Introduction

In Marion Parnell, Jr. v. Florida Department of Corrections (11th Cir. July 10, 2026), the Eleventh Circuit addressed two distinct tracks of issues: (1) the merits of an employee’s retaliation claims under Title VII and the ADA following a demotion and termination; and (2) attorney conduct in appellate practice—specifically, the submission of a reply brief containing non-existent court opinions and non-existent quotations.

The parties were Marion Parnell, Jr., an African-American male and former FDOC employee (plaintiff-appellant), and the Florida Department of Corrections (FDOC) (defendant-appellee). The key merits questions were whether Parnell could produce competent evidence that protected activity caused adverse employment actions. Separately, the court confronted whether counsel’s defective citations—suspected to be the product of generative AI “hallucinations” or otherwise—warranted sanctions, fee-shifting, striking portions of the brief, and referral for discipline.

2. Summary of the Opinion

  • Merits: The court affirmed summary judgment for FDOC on both claims:
    • Title VII retaliation: Parnell failed to show with competent evidence or favorable inferences that his EEOC complaint caused his demotion/termination, or that discipline was for any reason other than disciplinary infractions and excessive absenteeism.
    • ADA retaliation: Parnell likewise failed to show that his request for accommodation caused his demotion/termination.
  • Sanctions and discipline: The court
    • granted FDOC’s motion to strike the relevant portions of Parnell’s reply brief;
    • granted FDOC’s request for attorney’s fees for time spent preparing the motion to strike and for sanctions, reserving jurisdiction to set the amount after an affidavit-and-response process;
    • referred Parnell’s counsel, Dufirstson J. Neree, to the Committee on Lawyer Qualifications and Conduct under the Eleventh Circuit’s professional conduct framework.

3. Analysis

3.1. Precedents Cited

Baker v. Upson Reg'l Med. Ctr.

The court relied on Baker v. Upson Reg'l Med. Ctr. to restate the Eleventh Circuit’s de novo review of summary judgment, including the requirement that facts be viewed in the light most favorable to the nonmovant and that inferences be drawn in that party’s favor. This framing supported the court’s conclusion that, even under plaintiff-favorable review, Parnell lacked competent evidence of causation.

Purchasing Power, LLC v. Bluestem Brands, Inc.

For sanctions, the court grounded its inherent-authority analysis in Purchasing Power, LLC v. Bluestem Brands, Inc., emphasizing that “the key to unlocking a court’s inherent power is a finding of bad faith.” Importantly, the opinion applied the further point from Purchasing Power that, even without direct evidence of subjective bad faith, inherent-power sanctions may be appropriate where a party knowingly or recklessly raises a frivolous argument. This provided the doctrinal pathway for addressing fabricated citations: recklessness can substitute for proof of intent.

In re Amends. to Fla. Rule of Gen. Prac. & Jud. Admin. 2.515

While not controlling federal law, the court cited In re Amends. to Fla. Rule of Gen. Prac. & Jud. Admin. 2.515 as a salient, contemporary indicator of the judiciary’s response to generative AI risks. The reference underscored an emerging compliance expectation: the signer of a filing represents that identified authorities exist and are accurately cited, and sanctions may follow upon notice and an opportunity to be heard. The Eleventh Circuit used this citation to situate its own enforcement posture within a broader legal ecosystem increasingly focused on AI-driven citation integrity.

Rules and Standards Applied (Non-case Authorities)

  • Fed. R. Civ. P. 56(a): the summary-judgment standard applied on the merits.
  • 11th Cir. R., Addendum Eight, Rule 1: establishes that violations of professional responsibility constitute misconduct and authorizes a range of discipline (including monetary sanctions).
  • 11th Cir. R. 27-4: authorizes monetary and non-monetary sanctions, including attorney’s fees and costs to the opposing party.
  • Fed. R. Civ. P. 11(b)(2): invoked to emphasize that counsel’s signature certifies that contentions “are warranted by existing law”—a reminder that responsibility attaches regardless of delegation or tool usage.
  • Model Code of Pro. Conduct R. 1.1.: cited for the competence baseline (“legal knowledge, skill, thoroughness, and preparation reasonably necessary”).

3.2. Legal Reasoning

(A) Retaliation Claims and Causation

The court’s merits reasoning was concise and evidentiary in focus. Applying the Rule 56 framework, it held that Parnell did not produce competent evidence (or sufficient favorable inferences) that the relevant protected activities—his EEOC complaint (Title VII) and his ADA accommodation request (ADA)—caused the demotion and termination. The court also accepted FDOC’s explanation that discipline resulted from disciplinary infractions and excessive absenteeism, and found the record did not support a retaliatory causal link.

(B) Sanctions for Non-existent Authorities; Striking; Fee-Shifting; Referral

The sanctions portion of the opinion announces the court’s practical rule for appellate practice: attorneys must not cite authorities that do not exist, and failures of verification can be sanctionable—especially where the record suggests reckless reliance on unreliable sources.

Several features of the court’s reasoning are notable:

  1. Opportunity to explain; inadequate response: The court ordered supplemental briefing to identify the source of the defective cases and quotations, but counsel offered only that he could not locate a verified source and that the material “did not come from a verified review.” The absence of a coherent account of how the citations entered the brief contributed to the court’s view that counsel lacked candor and failed baseline diligence.
  2. Tool-agnostic responsibility: The court stated that whether the citations were AI-generated (as the panel suspected) or “simply made up,” it expected accurate representations from any attorney appearing before it. This is a critical doctrinal stance: the duty runs to the court and attaches to the filing, not to the method of drafting.
  3. Competence framing: By citing Model Code of Pro. Conduct R. 1.1., the court treated citation fabrication/verification failure as a competence problem, not merely a technicality—linking sanctions to professional norms of preparation and thoroughness.
  4. Multiple enforcement channels: The court used overlapping authorities:
    • 11th Cir. R. 27-4 for sanctions including fees;
    • Addendum Eight, Rule 1 for attorney discipline;
    • inherent power (as explained in Purchasing Power) to address bad faith or reckless frivolousness.
    This layered approach signals that defective citations can trigger not only case-level remedies (striking and fee-shifting), but also professional-discipline processes.

3.3. Impact

On Appellate Practice and AI Use

The opinion is a direct warning that the Eleventh Circuit will treat “hallucinated” authorities as a serious integrity breach. Three practical consequences are likely:

  • Verification as a non-delegable duty: Counsel must confirm that authorities exist and that quotations are accurate, regardless of whether drafting is assisted by staff, vendors, or generative AI.
  • Routine adversarial policing: Opposing parties may increasingly move to strike and seek fees when confronted with suspicious citations, especially in reply briefs where new support often appears.
  • Discipline risk beyond the case: Referral under Addendum Eight institutionalizes consequences beyond a single appeal, raising stakes for repeat or severe violations.

On Retaliation Litigation

On the merits, the decision reinforces a familiar summary-judgment reality in retaliation cases: absent competent evidence that protected activity caused the adverse action, and where the employer points to documented performance or attendance issues, a plaintiff may not survive Rule 56. Although the opinion does not elaborate a detailed burden-shifting framework, its holding underscores that causation evidence remains the hinge.

4. Complex Concepts Simplified

  • Summary judgment (Rule 56): The case can be decided without trial if there is no genuine dispute of material fact and one party is entitled to judgment as a matter of law.
  • Retaliation causation: The employee must show the adverse action happened because of protected activity (like filing an EEOC complaint or requesting an ADA accommodation), not merely that both occurred.
  • Inherent authority sanctions: Beyond written rules, federal courts have built-in power to protect proceedings from abuse; sanctions may require bad faith, but reckless frivolousness can suffice.
  • “Hallucinated” authorities: Citations or quotations that appear plausible but are fabricated or non-verifiable—often associated with generative AI outputs—are treated as misinformation to the court.
  • Motion to strike: A request to remove improper or unreliable portions of a filing so the court does not consider them.
  • Fee-shifting as a sanction: Ordering the offending side (or counsel) to pay the opponent’s attorney’s fees incurred in addressing the misconduct.

5. Conclusion

Parnell does two things at once. On the merits, it affirms summary judgment where the plaintiff failed to supply competent evidence tying protected activity to demotion and termination, and where the employer’s rationale centered on disciplinary infractions and absenteeism. More consequentially for day-to-day appellate practice, it crystallizes an enforcement posture: submitting non-existent authorities and quotations is sanctionable misconduct, warranting striking defective briefing, awarding attorney’s fees, and triggering disciplinary referral—regardless of whether the errors stem from generative AI or other drafting failures.