LitigationLegal Practice Management
Hallucinated Citations, Rule 11, and Generative AI in Legal Filings: What Courts Are Actually Doing
In 2023 a New York lawyer filed a brief containing six cases that did not exist, produced by a chatbot he had asked to find supporting authority and then asked whether the cases were real. The resulting sanctions opinion became the most widely read order in American legal practice that year, and it did not stop the problem. Courts across the country have since sanctioned lawyers, referred them to disciplinary authorities, struck filings, and in a growing number of cases denied relief outright because the supporting authority was fabricated. This article explains what actually happened in the leading cases, why large language models produce citations that look correct and are not, and what the governing rules require. It covers Rule 11 and its safe harbor, section 1927, inherent authority, the ethics rules that apply including competence, candor, confidentiality, supervision, and fees, and the ABA formal opinion addressing generative AI. It then turns to practice: the standing orders and local rules courts have adopted, what a defensible verification workflow looks like, how retrieval-based tools differ from open-ended chatbots, what to do if a fabricated citation has already been filed, and how to supervise the people who use these tools. It closes with a firm policy outline, a worked example, an FAQ, and related reading.