A California appellate court has issued a published opinion cautioning attorneys against unverified reliance on generative artificial intelligence (AI) for legal research. The court imposed a $10,000 sanction on a plaintiff’s counsel who submitted an appellate brief containing fictitious case citations generated by AI tools. This decision underscores the judiciary’s growing concern over the accuracy and reliability of AI-assisted legal work.
The attorney in question utilized AI to draft portions of the brief, resulting in citations to non-existent cases. The court emphasized that such “hallucinated” citations represent a significant breach of professional responsibility. In its opinion, the court stated, “Simply stated, no brief, pleading, motion, or any other paper filed in any court should contain any citations—whether provided by generative AI or any other source—that the attorney responsible for submitting the pleading has not personally read and verified.” ([socal-appellate.blogspot.com](https://socal-appellate.blogspot.com/2025/09/ai-sanctions-reach-ca.html?utm_source=openai))
This incident is part of a broader pattern of legal professionals facing repercussions for submitting AI-generated content without proper verification. For instance, in May 2025, a federal judge in California sanctioned two law firms after their attorneys filed a brief containing multiple fictitious citations produced by AI. The special master overseeing the case noted that approximately nine of the 27 legal citations in the ten-page brief were incorrect, with at least two referencing non-existent cases. ([arstechnica.com](https://arstechnica.com/tech-policy/2025/05/judge-initially-fooled-by-fake-ai-citations-nearly-put-them-in-a-ruling/?utm_source=openai))
Similarly, in July 2025, a federal judge in Alabama disqualified three attorneys from a case after they submitted filings with false citations generated by AI. The court found that the attorneys’ conduct was “tantamount to bad faith” and referred the matter to the state bar for further disciplinary action. ([reuters.com](https://www.reuters.com/legal/government/judge-disqualifies-three-butler-snow-attorneys-case-over-ai-citations-2025-07-24/?utm_source=openai))
These cases highlight the judiciary’s increasing scrutiny of AI’s role in legal practice. While AI tools can enhance efficiency, they also pose risks when used without adequate oversight. Legal professionals are reminded of their duty to ensure the accuracy of all filings, regardless of the tools employed in their preparation.
In response to these challenges, some courts have implemented measures to regulate AI usage. For example, the Orange County Superior Court requires attorneys to disclose any use of generative AI in filings and to certify the accuracy of all citations. ([ropesgray.com](https://www.ropesgray.com/en/sites/Artificial-Intelligence-Court-Order-Tracker/states/california?utm_source=openai))
As AI continues to permeate the legal field, practitioners must exercise caution and diligence. The recent sanctions serve as a stark reminder that the responsibility for accurate and truthful representations in court filings rests squarely on the shoulders of attorneys, irrespective of the tools they choose to utilize.