The Point of Signing: The Ninth Circuit's Precedential AI-Hallucination Sanctions and What Every Filing Now Requires
Summary
On June 3, 2026, the United States Court of Appeals for the Ninth Circuit issued a published, precedential opinion in *LNU v. Blanche*, sanctioning attorneys Mike Singh Sethi and William Rounds for filing briefs containing AI-generated fabrications. This decision establishes binding law across the Ninth Circuit's jurisdiction and serves as persuasive authority nationwide. The sanctions included a \$2,500 fine for each attorney, six-month suspensions from practice before the Ninth Circuit, and a mandate for their firm to include a perjury-backed statement in all future filings, disclosing AI use and certifying personal review. The court clarified that the professional duty is breached "at the point of signing and filing," not during AI research, and stressed the obligation to disclose the source of any discovered errors. This precedent was reinforced on June 8, 2026, when a Mississippi District Judge removed four lawyers for similar AI-hallucinated citations.
Key takeaway
For legal professionals and regulated organizations using generative AI for documents requiring professional attestation, you must prioritize human verification. Your signature on any filing or certification signifies personal review and accuracy, regardless of AI's role in drafting. Implement robust internal controls, including mandatory human verification of all AI-generated content and clear AI-use policies. If errors occur, immediately disclose them and their AI source to mitigate severe sanctions, as concealment draws harsher penalties.
Key insights
The duty to verify AI-generated content crystallizes at the point of signing and filing, requiring full disclosure of errors and their source.
Principles
- Professional responsibility attaches at signature, not during AI drafting.
- Candor requires immediate disclosure of AI-generated errors and their source.
- Perjury-backed certification of AI use and personal review is an appropriate remedy.
Method
Future filings must include a perjury-backed statement addressing AI use, naming the specific tool, and certifying personal review by the signing attorney, as imposed by the court.
In practice
- Verify every cited authority by a human before filing.
- Implement and enforce a firm-wide AI-use policy.
- Immediately disclose AI-generated errors and their source.
Topics
- AI Hallucinations
- Legal Sanctions
- Professional Ethics
- Generative AI Policy
- Appellate Precedent
- Duty of Candor
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Editorial summary, takeaway, and curation by AIssential. Original article published by Global Privacy Laws & Compliance Frameworks | ComplianceHub.Wiki.