A federal court fined a lawyer $6,000 for a brief built on an AI-hallucinated case

Verification status: PENDING — checker-graduated at confidence 1.000; awaiting HUMAN client-confirmation before the green verified badge. Not verified.

The problem

Tyrone A. Blackburn represented plaintiff Liza Gardner in her civil suit against Sean “Diddy” Combs and others. In opposing the defendants’ motions to dismiss, his brief “cited to a non-existent case” — “United States v. Masha, 990 F.3d 1005, 1014 (7th Cir. 2021)” — and relied on fabricated legal propositions. After defense counsel flagged in a reply brief that the citation could not be located, Blackburn did not respond, and the court issued an order to show cause why he should not be sanctioned.

What was built

Nothing was built — this is an AI-governance honest-negative. The “system” here is an unnamed generative-AI tool used as a drafting aid without a verification step. Blackburn “confirmed that he indeed used AI that provided him with hallucinated case law and propositions that he then incorporated into his response brief and that he failed to verify on subsequent review.” The order attributes the fabrication generically to “generative artificial intelligence” and names no product.

The outcome

On December 15, 2025, District Judge Leo M. Gordon — a U.S. Court of International Trade judge sitting by designation in the District of New Jersey — found that “Mr. Blackburn’s conduct plainly violated Rule 11” and ordered that “Plaintiff’s counsel, Mr. Blackburn, is sanctioned with a fine of $6,000.00 under Rule 11(c), to be made payable to the registry of this Court at a rate of $500/month.” The court set the amount at the higher end of the range because of a pattern of conduct — including a prior AI-related Rule 11 sanction Blackburn had received weeks earlier in the Western District of Pennsylvania (Jakes v. Youngblood, No. 2:24-cv-01608-WSS). It also imposed non-monetary sanctions: Blackburn must self-report the order to the attorney-licensing entities of New Jersey and New York, and serve and discuss it with his client. Every figure comes from the published court order, corroborated on the $6,000 and the Masha fabrication by two mutually independent, archive-bound newsrooms (Bloomberg Law, Billboard), and re-confirmed by a second court filing five months later.

Path to green

The origin is a published federal court order — self-authenticating; no confirmation call is booked against the court. Docket currency is already partly resolved: a contempt order-to-show-cause (ECF No. 109, May 7, 2026) and a May 11, 2026 hearing show the $6,000 sanction still STANDS — the court issued an oral admonition over Blackburn’s missed installment payments (after new counsel agreed to cover the balance) and did NOT vacate or reduce the sanction. Two items remain checker/human pre-green: (1) confirm no later vacatur, reconsideration, or appeal of the December 15, 2025 order; and (2) whether the $6,000 was ultimately paid in full. The specific AI product used was not named in the order and is asserted by no claim.