What was hallucinated

Fabricated: Case Law || Fabricated: Case Law

Details

" We have the authority to sanction Wife under Florida Rule of Appellate Procedure 9.410(a) for failure to comply with Florida Rule of Appellate Procedure 9.210(c). See Gutierrez v. Gutierrez, 399 So. 3d 1185, 1188 (Fla. 3d DCA 2024). However, we decline to do so. Our decision is tempered by the fact that Wife is defending a judgment on appeal in an unrepresented capacity, Husband has not sought the imposition of sanctions, and Wife has not brought any other meritless or frivolous filings in this Court. See id. at 1187–88; Al-Hamim, 564 P.3d at 1125–26. Instead, we admonish Wife for her counterfeit brief and warn her that the Court will not regard similar infractions as mildly in the future. "

Sanction teardown · CA Florida (4d), USA · 2025-08-13

Goya v. Hayashida

What happened

In CA Florida (4d), USA, a filing relied on an unnamed/unconfirmed AI tool to help draft legal argument. The court identified the following problems with the citations in that filing:

Issue

Fabricated: Case Law
Issue

Fabricated: Case Law

Which AI tool

an unnamed/unconfirmed AI tool. Note: Charlotin's public database records tool attribution only where a court order, brief, or reporting on the matter states it explicitly; "unidentified" or "implied" means the record indicates AI use but does not name a specific product — we do not guess.

Outcome

Warning

Additional detail

" We have the authority to sanction Wife under Florida Rule of Appellate Procedure 9.410(a) for failure to comply with Florida Rule of Appellate Procedure 9.210(c). See Gutierrez v. Gutierrez, 399 So. 3d 1185, 1188 (Fla. 3d DCA 2024). However, we decline to do so. Our decision is tempered by the fact that Wife is defending a judgment on appeal in an unrepresented capacity, Husband has not sought the imposition of sanctions, and Wife has not brought any other meritless or frivolous filings in this Court. See id. at 1187–88; Al-Hamim, 564 P.3d at 1125–26. Instead, we admonish Wife for her counterfeit brief and warn her that the Court will not regard similar infractions as mildly in the future. "

How Citation Safe would have caught this

Citation Safe runs three deterministic layers before a brief is filed: (1) does the citation exist against CourtListener's database of published opinions, (2) if quoted, does that exact language appear in the source, (3) does the cited case actually support the proposition it is cited for. Fabricated case citations fail Layer 1. Fabricated or misattributed quotations fail Layer 2 even when the underlying case is real. Misrepresented holdings — a real case cited for a proposition it does not support — are the target of Layer 3. None of these checks involve asking another language model whether the citation looks right; they are lookups and text-matches against the actual source, which is why a hallucinated citation has to survive a direct lookup against the authoritative source — not another model's opinion — to earn a VERIFIED stamp; our measured false-verify rate is published live at /quality.

Check a brief before you file it → · See our live false-verify rate

Source: Damien Charlotin's public AI Hallucination Cases Database (CC0).