Incident Tracker / United States (federal)
United States v. Marquez
·United States Court of Appeals for the Fifth Circuit·US-FEDWarningprovisional
The Fifth Circuit on 2026-04-24 warned the self-represented plaintiff to verify legal authorities and cautioned that future hallucinated or nonexistent citations may bring sanctions in United States v. Jose Marquez. The self-represented plaintiff filed a brief with one fabricated case citation, one false case quotation, and one mischaracterized case citation.
- Court
- United States Court of Appeals for the Fifth Circuit
- Date
- 2026-04-24
- Who used the AI
- Litigant in person
- AI tool
- Not identified in the record
- Conduct
- Marquez’s pro se appellate brief cited cases that do not exist and nearly every quotation from existing caselaw was misquoted or fabricated; the court also found most cited propositions inapposite or contrary to the cited cases.
- Outcome
- Warning
- Penalty
- No monetary penalty recorded
- Regulatory outcome
- No separate regulatory disposition recorded
- Status
- Provisional — written by the court-decisions pipeline, awaiting the editor
- Last checked
- 2026-09-08
Primary sources for this incident
Related regulation records for this incident
No related regulation record has been linked to this incident yet.
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Cite this record
SafeLegalAI Global Legal AI Incident Tracker, “United States v. Marquez”, safelegalai.com/tracker/united-states-v-jose-marquez (accessed 2026-10-07). Data: CC BY 4.0.