What was hallucinated

Fabricated: Case Law | Plaintiff cited ten case authorities that did not exist; the Court independently verified the citations were sham despite looking legitimate and ordered an explanation. || False Quotes: Case Law | Plaintiff falsely quoted Rescue Army to claim courts lack power to determine their own jurisdiction; the case contains no such quote and holds the opposite. || Misrepresented: Legal Norm | Plaintiff misrepresented the legal rule that a jurisdictional challenge strips a court of jurisdiction; the Court clarified a challenge does not alter jurisdiction and courts may decide their own jurisdiction.

Details

AI UseJerry Thomas filed pro se pleadings citing at least ten fabricated cases. The citations appeared plausible but did not correspond to any real authorities. Despite opportunities to explain, Thomas gave vague excuses about "self-research" and "assumed reliability," without clarifying the sources - suggesting reliance on AI-generated content.Hallucination DetailsTen fake case citations systematically inserted across filingsFabricated authorities mimicked proper citation format but were unverifiable in any recognized databaseThe pattern mirrored known AI hallucination behaviors: fabricated authorities presented with apparent legitimacyRuling/SanctionThe Court dismissed the action with prejudice as a Rule 11 sanction. It emphasized that fake citations delay litigation, waste judicial resources, and erode public confidence. The Court explicitly invoked Mata v. Avianca for the broader dangers of AI hallucinations in litigation and found Thomas acted in bad faith by failing to properly explain the origin of the fabrications.Key Judicial ReasoningCiting fabricated cases (even if resulting from AI use or negligence) is sanctionable because it constitutes an improper purpose under Rule 11. Sanctions were deemed necessary to deter further abuses, with dismissal considered more appropriate than monetary penalties given the circumstances.

Sanction teardown · S.D. Georgia, USA · 2023-10-06

Thomas v. Pangburn

What happened

In S.D. Georgia, 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:

Fabricated (Case Law)

Plaintiff cited ten case authorities that did not exist; the Court independently verified the citations were sham despite looking legitimate and ordered an explanation.
False Quotes (Case Law)

Plaintiff falsely quoted Rescue Army to claim courts lack power to determine their own jurisdiction; the case contains no such quote and holds the opposite.
Misrepresented (Legal Norm)

Plaintiff misrepresented the legal rule that a jurisdictional challenge strips a court of jurisdiction; the Court clarified a challenge does not alter jurisdiction and courts may decide their own jurisdiction.

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

Dismissal of Case as Sanction for Bad Faith + Judicial Rebuke

Additional detail

AI UseJerry Thomas filed pro se pleadings citing at least ten fabricated cases. The citations appeared plausible but did not correspond to any real authorities. Despite opportunities to explain, Thomas gave vague excuses about "self-research" and "assumed reliability," without clarifying the sources - suggesting reliance on AI-generated content.Hallucination DetailsTen fake case citations systematically inserted across filingsFabricated authorities mimicked proper citation format but were unverifiable in any recognized databaseThe pattern mirrored known AI hallucination behaviors: fabricated authorities presented with apparent legitimacyRuling/SanctionThe Court dismissed the action with prejudice as a Rule 11 sanction. It emphasized that fake citations delay litigation, waste judicial resources, and erode public confidence. The Court explicitly invoked Mata v. Avianca for the broader dangers of AI hallucinations in litigation and found Thomas acted in bad faith by failing to properly explain the origin of the fabrications.Key Judicial ReasoningCiting fabricated cases (even if resulting from AI use or negligence) is sanctionable because it constitutes an improper purpose under Rule 11. Sanctions were deemed necessary to deter further abuses, with dismissal considered more appropriate than monetary penalties given the circumstances.

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: https://www.damiencharlotin.com/documents/252/Thomas_v._Pangburn_S.D.Ga._October_6_2023.pdf, via Damien Charlotin's public AI Hallucination Cases Database (CC0).