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Allen v. Hunt

Court
N.D. Illinois
Jurisdiction
USA
Decided
2026-04-13
AI tool
Implied
Outcome
Warning
Monetary penalty
None reported

What was hallucinated

Fabricated: Case Law | Court and Magistrate Judge noted prior filings containing false citations and quotes; Judge Kendall previously found filings with citations to nonexistent cases and quotes from no real case and imposed a $1,500 Rule 11 sanction in a separate matter. || Fabricated: Case Law | Plaintiff cited "Sterigenics U.S., LLC v. Sotera Health Co., 2020 WL 5645683 (N.D. Ill. Sep. 22, 2020)", which the Court found does not exist; plaintiff admitted the citation was fabricated and filed a notice of correction.

Sanction teardown · N.D. Illinois, USA · 2026-04-13

Allen v. Hunt

What happened

In N.D. Illinois, 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)
    Court and Magistrate Judge noted prior filings containing false citations and quotes; Judge Kendall previously found filings with citations to nonexistent cases and quotes from no real case and imposed a $1,500 Rule 11 sanction in a separate matter.
  • Fabricated (Case Law)
    Plaintiff cited "Sterigenics U.S., LLC v. Sotera Health Co., 2020 WL 5645683 (N.D. Ill. Sep. 22, 2020)", which the Court found does not exist; plaintiff admitted the citation was fabricated and filed a notice of correction.

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

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/1987/Allen_v._Hunt_USA_13.pdf, via Damien Charlotin's public AI Hallucination Cases Database (CC0).

Source: https://www.damiencharlotin.com/documents/1987/Allen_v._Hunt_USA_13.pdf

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