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Helen Allen v. Cass Casper and Disparti Law Group

Court
N.D. Illinois
Jurisdiction
USA
Decided
2026-03-10
AI tool
Implied
Outcome
Monetary Sanction
Monetary penalty
1500 USD

What was hallucinated

Fabricated: Case Law | Plaintiff cited a nonexistent case 'Krause v. Meyers' to support malpractice theory; the court found 'Krause' is fabricated and an AI hallucination and rejected reliance on it. || Fabricated: Case Law | Plaintiff cited 'Governmental Interinsurance Exchange v. Judge, 221 Ill. App. 3d 586', which the court determined does not exist and was another AI-generated fabrication.

Sanction teardown · N.D. Illinois, USA · 2026-03-10

Helen Allen v. Cass Casper and Disparti Law Group

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)
    Plaintiff cited a nonexistent case 'Krause v. Meyers' to support malpractice theory; the court found 'Krause' is fabricated and an AI hallucination and rejected reliance on it.
  • Fabricated (Case Law)
    Plaintiff cited 'Governmental Interinsurance Exchange v. Judge, 221 Ill. App. 3d 586', which the court determined does not exist and was another AI-generated fabrication.

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

Monetary Sanction (monetary penalty: 1500 USD.)

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/1663/Allen_v._Casper_USA_10_March_2026.pdf, via Damien Charlotin's public AI Hallucination Cases Database (CC0).

Source: https://www.damiencharlotin.com/documents/1663/Allen_v._Casper_USA_10_March_2026.pdf

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