Federal Court Sanctions Attorney $2,500 for Fabricated Case Citations in AI-Assisted Legal Filings

A U.S. federal court has imposed sanctions totaling $2,500 on attorney Tricia S. Lindsay after determining that two legal memoranda she filed contained fabricated case citations. The decision, issued Wednesday by Magistrate Judge Gabriel W. Gorenstein in the Southern District of New York (S.D.N.Y.), underscores the dangers of AI-assisted legal drafting and the judiciary’s strict stance on misleading filings.

Lindsay, who previously ran as a candidate for the New York State Senate in 2024, represented plaintiff Sai Malena Jimenez-Fogarty in the case Jimenez-Fogarty v. Fogarty. In response to two motions to dismiss, she submitted two memoranda of law that included citations to seven nonexistent cases. The court subsequently issued an Order to Show Cause, compelling Lindsay to explain why she should not face sanctions for the misleading filings.

After reviewing Lindsay’s response, the court concluded that sanctions were warranted. In its order, the court distinguished between various types of citation errors and focused specifically on instances where:

• Cases cited could not be located by name or at the specified location in legal databases;
• Cited cases bore no relation to the legal propositions for which they were invoked;
• Citations were entirely fabricated, demonstrating a lack of diligence or reliance on unverified sources.

The court emphasized that it was not addressing typographical errors, incorrect page references, or mischaracterizations of existing cases—all of which, while problematic, do not rise to the level of outright fabrication. Instead, the ruling targets citations that were completely made up and unsupported by any verifiable legal authority.

AI Hallucinations and the Failure to Provide a Coherent Explanation

Lindsay’s response to the court’s inquiry failed to meet the standard expected in similar cases. The court had explicitly ordered her to provide “a complete and detailed description of the process of the drafting of the two memoranda of law.” Most attorneys in such situations acknowledge reliance on AI tools and explain how errors occurred. However, Lindsay’s sworn statement contained only vague generalities and conclusory assertions, offering no substantive explanation for how the fabricated citations entered her filings.

The court noted that Lindsay’s response avoided answering fundamental questions, such as the origin of the nonexistent citations. Instead, she asserted that she follows “a structured and diligent process designed to ensure accuracy, thoroughness, and compliance with all applicable legal and ethical standards.” Notably, she described her “typical” process for drafting briefs without confirming that this process was actually followed in the disputed memoranda. The court interpreted this as an implication that her standard procedure was used, despite the absence of specific attestation.

Lindsay also claimed to “manually cross-check case names, docket numbers, and reporter citations against the primary sources in legal databases.” Yet, the court found this explanation insufficient in light of the undisputed fabrication of seven case citations. The ruling suggests that even manual verification may be inadequate if it fails to detect AI-generated hallucinations or unverified sources.

Court’s Findings and Sanctions

The court’s opinion detailed seven specific fabricated citations, each of which either did not exist or was cited in a manner entirely disconnected from its actual legal relevance. Examples included cases that could not be located in any legal database, citations to non-existent reporters, and references to cases that had no bearing on the legal arguments presented.

In imposing sanctions, the court cited the misleading nature of the filings, the waste of judicial resources, and the potential harm to the opposing party caused by the false citations. The $2,500 sanction reflects the court’s assessment of the severity of the misconduct and the need to deter similar behavior in future cases.

This case serves as a cautionary tale for legal practitioners utilizing AI tools in drafting legal documents. While AI can enhance efficiency, the court’s ruling makes clear that attorneys remain ultimately responsible for the accuracy and integrity of their filings. Reliance on unverified AI outputs—particularly without rigorous human review—can lead to severe professional and financial consequences.