The Nebraska Supreme Court has suspended attorney Greg Lake indefinitely after he submitted a court brief in a divorce appeal that contained a staggering 57 defective citations out of 63, including 20 entirely fabricated case references and four nonexistent cases. This ruling, issued on April 15, marks one of the most severe professional sanctions tied to the misuse of artificial intelligence (AI) in the legal sector to date.
This case came to light during oral arguments in February, when justices became concerned about errors in Lake’s brief that could not be reconciled with existing Nebraska case law. The brief was submitted as part of a dispute over the division of marital assets and child custody. According to the court, the sheer volume of inaccuracies—57 out of 63 citations—indicated serious violations of professional conduct rules that require honesty and integrity before the tribunal.
Lake attributed the errors to personal circumstances, claiming he was on his 10th wedding anniversary when his computer malfunctioned while traveling, leading him to upload the wrong version of the brief. However, the justices found his explanation unconvincing, particularly after an investigation revealed that Lake had likely relied on AI to draft the brief while failing to disclose this to the court. The Nebraska Supreme Court’s opinion was unequivocal, stating, “AI, like other technological tools, can be a benefit to the legal community, but it must be used with caution and humility.”
The court criticized Lake for his failure to verify the citations, which could have easily been checked through standard legal research platforms. By not doing so, he showed a clear neglect of his duty of candor, further compounding the severity of his actions.
The Broader Sanctions Landscape
Lake’s case is not an isolated incident. Damien Charlotin, a researcher at HEC Paris, has been tracking AI hallucination cases in legal proceedings and reports over 1,200 such instances globally, with about 800 occurring in U.S. courts. The frequency of these cases has reached alarming levels, with Charlotin noting that sometimes there are “ten cases from ten different courts on a single day.”
Oregon currently holds the record for the largest aggregate sanction tied to a single attorney for AI-related filing errors, amounting to $109,700. Meanwhile, the Sixth Circuit has imposed a $30,000 fine on two Tennessee attorneys, marking the largest federal appellate sanction linked to fabricated citations. If upheld, Nebraska’s indefinite suspension of Lake would represent a significant escalation, transforming financial penalties into career suspensions due to AI-related issues.
The implications of these legal sanctions extend beyond individual cases. Each incident linked to AI models sends a regulatory signal regarding the acceptable use of such technology in professional environments. The legal profession’s ongoing response to AI hallucinations serves as a critical benchmark for other sectors, indicating what constitutes “responsible deployment” in high-stakes regulated environments. As the AI landscape continues to evolve, the same scrutiny applied to the legal sector is likely to extend to fields like finance, healthcare, and government applications, underscoring the need for rigorous oversight.
This case highlights a pivotal moment for the legal community as it grapples with the challenges posed by integrating AI into its practices. The Nebraska Supreme Court’s ruling not only serves as a cautionary tale for attorneys but also emphasizes the broader responsibilities of all professionals using AI tools. As reliance on these technologies grows, the legal implications of their misuse will likely become a focal point for regulatory frameworks across various industries.
See also
OpenAI’s Rogue AI Safeguards: Decoding the 2025 Safety Revolution
US AI Developments in 2025 Set Stage for 2026 Compliance Challenges and Strategies
Trump Drafts Executive Order to Block State AI Regulations, Centralizing Authority Under Federal Control
California Court Rules AI Misuse Heightens Lawyer’s Responsibilities in Noland Case
Policymakers Urged to Establish Comprehensive Regulations for AI in Mental Health
