Wireless Investors LLC v. Semtech Incorporated, et al.
U.S. District Court, District of Arizona · D. Ariz. · Arizona bar guidance
Verified May 14, 2026
- Citation
- Wireless Investors LLC v. Semtech Inc., No. CV-25-02633-PHX-DJH (D. Ariz. Dec. 18, 2025) (Humetewa, J.)
- Decided
- December 18, 2025
Summary
Plaintiff Wireless Investors LLC opposed Defendants' removal of a contract dispute from Maricopa County Superior Court to the District of Arizona. Judge Diane J. Humetewa denied the Motion to Remand and, in a closing paragraph, flagged that Plaintiff's citations "at times, included nonexistent quotes, misstated the holding, did not support the premise put forth by Plaintiff, or were not applicable to the current situation." Specifically identified defects included a quote ("Where significant contacts with the forum state exist and no unique federal interest is implicated, remand may be appropriate") that "does not appear anywhere in" Gardner v. UICI, 508 F.3d 559 (9th Cir. 2007), a misreading of Hunter v. Philip Morris USA, and a parenthetical for Hensgens v. Deere & Co. attributing language the Fifth Circuit "did not, however, offer." The order does not name the AI tool, but the pattern (fabricated quote, misstated holdings, off-point cites) matches generative-AI hallucination signatures.
- AI tool:
- Unspecified generative AI
What sanction did the court impose?
No monetary sanction. The Court issued a written caution to Plaintiff's counsel "to exercise greater diligence in compiling the legal authority it submits to the Court." The Motion to Remand was denied on the merits.
Why does Wireless Investors LLC v. Semtech Incorporated, et al. matter for law firms using AI?
Wireless Investors illustrates the warning-shot end of the AI-citation spectrum: no Rule 11 motion, no monetary sanction, no referral, just a one-paragraph judicial reprimand that the brief’s authorities did not say what counsel claimed they said. For a managing partner, the lesson is that courts are now spotting and calling out fabricated-quote and miscast-holding patterns sua sponte, even when opposing counsel never raises them and even when the underlying motion is otherwise resolved on the merits. A “cautioned to exercise greater diligence” line in a published order is itself a reputational artifact that follows the firm and the named attorney into every future Westlaw search.
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.