Allen v. Casper
U.S. District Court, Northern District of Illinois · N.D. Ill. · Illinois bar guidance
Conduct
Pro se plaintiff filed 112-page opposition with two fabricated Illinois Appellate Court citations and AI-generated content.
Consequence
Motion to dismiss granted with prejudice; $1,500 Rule 11 sanction payable to Clerk of Court.
Lesson
Chief Judge Kendall now names AI-generated filings explicitly on the record and treats them as Rule 11 violations even by pro se filers.
Verified May 7, 2026
- Citation
- Allen v. Casper, No. 1:25-cv-10438 (N.D. Ill. Mar. 10, 2026) (Kendall, C.J.)
- Decided
- March 10, 2026
Summary
Pro se plaintiff Helen Allen filed a 112-page opposition to defendants' motion to dismiss in a contract dispute against attorney Cass Casper and the Disparti Law Group. Chief Judge Virginia M. Kendall identified two fabricated Illinois case citations in the brief: "Krause v. Meyers, 200 Ill. App. 3d 782 (1990)" and "Governmental Interinsurance Exchange v. Judge, 221 Ill. App. 3d 586 (1991)." The court found that "Krause" is "not a real case" and concluded it was "an AI hallucination and a material" misrepresentation, and that "there is no 'Governmental Interinsurance Exchange v. Judge' case." The court further concluded that "there is little doubt that Allen's 112-page opposition" was AI-generated based on its content.
- AI tool:
- Unspecified generative AI
- Sanction amount:
- $1,500
What sanction did the court impose?
Defendants' motion to dismiss granted with prejudice. Civil case terminated. Allen ordered to pay $1,500 to the Clerk of the Court for violating Rule 11 of the Federal Rules of Civil Procedure.
Why does Allen v. Casper matter for law firms using AI?
Allen v. Casper is the rare case where Chief Judge Kendall makes the AI provenance finding explicit on the record rather than implicit. The court did not require an admission from Allen; it inferred AI generation from the structure and content of the 112-page opposition and treated the inference as sufficient to support a Rule 11 sanction. The sanction amount, $1,500 payable to the Clerk of the Court, is small in absolute dollars but procedurally significant: it is paid into the public fisc rather than to opposing counsel, signaling that the court treats the violation as a wrong against the judicial system itself rather than a fee-shifting matter between the parties.
For firms practicing in N.D. Ill., the case is a reminder that Chief Judge Kendall will name AI hallucinations explicitly when she finds them. The cited fabrications followed the standard pattern of plausible-looking case names with real-sounding reporter cites that resolve to nothing in the Illinois Appellate Court database. A simple Westlaw or Lexis lookup would have caught both. The 112-page brief length, far in excess of what the dispute warranted, was itself a signal to the court that human drafting effort had likely been substituted with AI generation, and the court treated that bulk as evidence rather than effort.
Implications for your firm
Operational steps a firm reading this case may wish to consider documenting. Strategic and rule-application calls belong to your firm's attorneys.
- Verify every Illinois Appellate Court citation against Westlaw, Lexis, or the Illinois Courts opinion search before relying on it; the volume metric (112 pages) was itself a flag for the court.
- When opposing pro se litigants in N.D. Ill. expect AI-generated bulk filings; Rule 11 cite-checking exposure is the same as for represented parties.
- Document the firm's own cite-verification protocol so a Rule 11 inquiry can establish that any citation passed through human review before filing.
Sources
Primary sources
Further reading
Source PDF is a Westlaw printout mirrored from the Damien Charlotin hallucination database. We are working to add the underlying court docket (PACER, CourtListener, or court website) as a second source.