Westlaw's AI and Co-Pilot, in the MyPillow defamation case. Invented quotations attributed to real opinions.
Eric Coomer's defamation suit against Michael Lindell, FrankSpeech, and MyPillow was heading to trial. The defendants' brief opposing a motion in limine contained nearly thirty defective citations.
The filing misquoted cases, misstated legal principles, attributed cases to the wrong courts, and cited cases that do not exist, including Perkins v. Federal Fruit & Produce Co. and Estate of Martinelli. The Court raised the errors at the pretrial conference. Lead counsel Christopher Kachouroff admitted he drafted the brief, ran it through AI, and did not check the citations before filing. Counsel's later claim that they had mistakenly filed an earlier draft was not supported by the record.
Offered for: that reputation evidence is admissible
The Court made its order to show cause absolute and found that Kachouroff and co-counsel Jennifer DeMaster violated Rule 11. It sanctioned Kachouroff and his firm, jointly and severally, $3,000, and DeMaster individually $3,000, payable to the court's registry by August 4, 2025. It did not extend the sanctions to the Lindell, FrankSpeech, or MyPillow defendants.
Kingsfield returned REJECT. The opposition quotes a case as saying words it never says. The court found the quoted line does not appear in the cited opinion.
This matter is among the US case-law cases we ran Kingsfield against in the Charlotin benchmark. Kingsfield's existence check confirms every citation against the case-law corpus and an independent source (CourtListener) before any claim resting on it can stand. Across the run Kingsfield ruled 696 of 700 testable claims correctly, including every one of the 504 fabricated citations and 92 fabricated quotes.
Honest scope. This measures Kingsfield's ruling layer given an extracted citation, not an end-to-end run over a full brief. The case record and the AI-tool attribution come from Damien Charlotin's public database and the court order; the verdict is Kingsfield's. See the full 700-claim benchmark.