Mims v. Brown
U.S. District Court, Western District of Wisconsin · W.D. Wis. · Wisconsin bar guidance
Conduct
Pro se incarcerated plaintiff filed multiple motions to amend with PDF metadata identifying ChatGPT as the source.
Consequence
Motions denied. Rule 11 warning issued; no formal sanction. Court advised plaintiff that AI filings typically lack substantive helpfulness.
Lesson
PDF metadata is now a forensic signal courts use to identify AI-drafted filings before any specific fabricated citation surfaces.
Verified May 8, 2026
- Citation
- Mims v. Brown, No. 3:25-cv-00042-jdp, Dkt. 50 (W.D. Wis. Jan. 29, 2026) (Peterson, J.)
- Decided
- January 29, 2026
Summary
Reginald Mims, an incarcerated pro se plaintiff, filed a 42 U.S.C. Section 1983 civil rights action against defendant Logan Brown and others on January 22, 2025. Over the course of the litigation Mims filed multiple motions to amend his complaint (Dkt. 41, 44, 45, 47). In a January 29, 2026 order, District Judge James D. Peterson denied the amendment motions on the merits and separately addressed the source of Mims's filings. The court observed that PDF metadata on several of Mims's submissions identified ChatGPT as the source of the document and warned that "AI-generated court filings often contain inaccurate factual representations, 'hallucinated' citations to non-existent cases, or fake quotations," citing Jones v. Kankakee County Sheriff's Department, No. 25-1251, 2026 WL 157661 (7th Cir. Jan. 21, 2026).
- AI tool:
- ChatGPT (identified in PDF metadata of the plaintiff's filings)
What sanction did the court impose?
Mims's motions to amend his complaint were denied. No formal sanction was imposed, but the court issued an explicit Rule 11 warning that future filings containing hallucinated citations or fake quotations could result in sanctions including dismissal. The court counseled that even when AI-drafted filings avoid misrepresentations, they typically lack substantive helpfulness, and that any litigant who uses AI remains fully responsible for verifying the accuracy of every citation before filing.
Why does Mims v. Brown matter for law firms using AI?
Mims v. Brown is a January 2026 W.D. Wisconsin order in which Chief Judge James D. Peterson identified PDF metadata as a forensic signal of generative AI authorship before any specific fabricated citation was found. The order is one of the earliest published examples of a district court relying on document metadata, rather than on the content of citations themselves, to ground an AI-related Rule 11 warning. Peterson cited Jones v. Kankakee County Sheriff’s Department, No. 25-1251, 2026 WL 157661 (7th Cir. Jan. 21, 2026), an opinion the Seventh Circuit had issued eight days earlier, as governing authority on the warning standard. The procedural posture is the conventional pro se prisoner Section 1983 action; the AI angle surfaced because Mims filed at least four successive motions to amend, several of which carried ChatGPT in their PDF properties. Cross-reference: SEC v. Nantomah (E.D. Wis. Jan. 30, 2026) (Pepper, C.J.) (parallel E.D. Wis. AI-citation order issued by the chief judge of the sister district one day later).
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.
- Train litigation associates that PDF metadata can identify the drafting tool; counsel should scrub or verify metadata when filing electronically and treat metadata-based AI identification as an evidentiary fact, not just procedural color.
- When opposing a pro se incarcerated litigant suspected of using generative AI, request the unredacted electronic version of filings if the metadata is missing from the served copy; metadata can corroborate hallucination patterns and support a Rule 11 motion.
- Document a chambers-aware citation protocol that anticipates the Seventh Circuit's growing body of AI-citation case law (Jones v. Kankakee Cnty., 2026 WL 157661); courts in this circuit increasingly cite parallel authority when issuing AI warnings.
Sources
Primary sources
- The order's reference to ChatGPT-identifying metadata in PDF properties is reconstructed from a docket-entry extraction rather than verbatim quotation from a paginated copy of the order; the verbatim phrasing of the metadata-identification finding may differ slightly.
- The Jones v. Kankakee County Sheriff's Department citation (No. 25-1251, 2026 WL 157661, 7th Cir. Jan. 21, 2026) is referenced in the order as supporting authority for the AI-hallucination warning; it appears the Seventh Circuit issued that opinion eight days before this order.