A federal judge struck a lawyer's brief over 17 AI-fabricated quotations and folded the conduct into a grievance referral

The problem

Joseph Cartagena, the rapper Fat Joe, is in consolidated litigation in the Southern District of New York with his former hype-man Terrance “T.A.” Dixon and Dixon’s attorney, Tyrone A. Blackburn (Dixon v. Cartagena, No. 25 Civ. 5144; Cartagena v. Dixon, No. 25 Civ. 3552) (source). On June 1, 2026, Roc Nation LLC moved for sanctions against Dixon, Blackburn, and T.A. Blackburn LLC (source). Roc Nation described Blackburn’s July 1, 2026 opposition brief as “untimely, exceeds this Court’s word limit, and contains what appear to be AI-hallucinated citations” (source).

What was built

Nothing was built here: this is an AI-governance honest-negative, published because a verifiable, independent adjudicator put the failure on the record. The “system” is generative AI used to draft a legal brief that was filed without verifying that the quoted language actually appears in the cited cases (source). The order names no specific product; press reports Blackburn attributed some citations to a LexisNexis research tool, a detail that does not appear in the order (source).

The outcome

The finding that gets quoted: quotation marks around language that is not in the cited cases on 17 occasions. On July 10, 2026, Magistrate Judge Jennifer E. Willis granted Roc Nation’s motion to strike, so the sanctions motion “will be considered unopposed” and “a separate Order on the motion for sanctions will follow” (source). The court found that Blackburn “does not dispute that on seventeen occasions he included language in quotation marks that is not identical to language in the cited cases,” and rejected his defense that such language was “a paraphrase or compression that faithfully states the court’s holding” (source). An independent newsroom narrated the same finding: Blackburn “put language in quotes on 17 different occasions that doesn’t appear anywhere in the cases he cited them to, and he didn’t dispute it” (source).

The referral: a grievance-committee escalation, not a new fine. Finding “a pattern of complete disregard for his ethical obligations to make accurate representations to the Court,” Judge Willis ordered that “this behavior will be incorporated in his referral to the Grievance Committee” for the S.D.N.Y. (source). The order recites a repeat pattern: a W.D. Pa. court imposed a monetary sanction against Blackburn for five thousand dollars in Jakes v. Youngblood (2025), and the District of New Jersey sanctioned him in Gardner v. Combs (Dec 2025) for citing AI-hallucinated nonexistent cases (source).

This order imposes no dollar sanction of its own. The amount, if any, comes in the separate order that “will follow”; no figure may be attached to this story until that order is filed and archived (source).

How this was verified

Court-origin honest-negative, checked live on 2026-08-17. The primary is the July 10, 2026 Order (Dkt. No. 220, Hon. Jennifer E. Willis), retrieved from the RECAP docket on CourtListener as a text-bearing seven-page PDF and byte-tied to the Wayback Machine (sha1-b32 2ZSGH6C6Q7FZ5I2D3RLBFMHC7GZI2AXY, capture 20260712094823). A published federal order is self-authenticating; the verbatim rulings are additionally carried by two independent archive-bound newsrooms, Reason’s Volokh Conspiracy (which reproduces the order) and AllHipHop (independent narration). The honest limit: this order announces a strike and a grievance escalation but no dollar sanction of its own. The forthcoming monetary-sanctions order is a separate future record, and no dollar figure appears here because none has been filed.

Related case files

The same attorney is the subject of Jakes v. Youngblood, the W.D. Pa. Rule 11 sanction the Willis order cites as prior discipline, and Gardner v. Combs, the District of New Jersey sanction it cites alongside it; together they are the “pattern” the grievance referral rests on. On the specific mechanic of fabricated language inside quotation marks (as opposed to fabricated case names), see US v. Farris, where a court likewise treated invented quotations as the core violation.

Sources

Checked live 2026-08-17. Tier 1 = court document; Tier 2 = independent press.

1. U.S. District Court, S.D.N.Y., Order on Motion to Strike, Cartagena v. Dixon / Dixon v. Cartagena, Dkt. No. 220 (Hon. Jennifer E. Willis), 2026-07-10 (Tier 1, primary court order; RECAP docket on CourtListener, byte-tied to Wayback capture 20260712094823). https://www.courtlistener.com/docket/69979017/cartagena-v-dixon/
2. Reason (The Volokh Conspiracy), Eugene Volokh, “Lawyer Shows ‘Complete Disregard for His Ethical Obligations to Make Accurate Representations to the Court,’ Magistrate Judge Says,” 2026-07-10 (Tier 2, independent, reproduces the order). https://reason.com/volokh/2026/07/10/lawyer-shows-complete-disregard-for-his-ethical-obligations-to-make-accurate-representations-to-the-court-magistrate-judge-says/
3. AllHipHop, “EXCLUSIVE: Tyrone Blackburn Gets Buried By Judge & Facing Contempt As Fat Joe Case Turns Brutal,” 2026-07 (Tier 2, independent narration of the July 10 order). https://allhiphop.com/news/exclusive-tyrone-blackburn-gets-buried-by-judge-facing-contempt-as-fat-joe-case-turns-brutal/