Canadian Lawyer Suspended for Six Months Over AI-Generated Legal Citations
Canadian lawyer Mary Hyun-Sook Lee has been suspended for six months and fined 10,000 Canadian dollars (over 6,000 euros) for submitting AI-generated legal documents and citing non-existent cases. The disciplinary action stems from her use of artificial intelligence in an inheritance case in 2025, where she presented fabricated case law both in writing and in court. The Toronto Star reported that another cited case was factually irrelevant, and in a separate instance, a relevant case was cited with an incorrect outcome. When questioned, Lee initially blamed a fictional law student assistant, claiming ignorance of AI tools like ChatGPT. However, an investigation by a legal oversight body revealed she had no assistants at the time. Further examination of her computer records showed she continued to misuse AI, even using ChatGPT to seek advice on how to avoid disciplinary action after being caught. This case is believed to be the first public ruling on the improper use of AI in a lawyer's disciplinary proceedings in Canada. While other countries have seen similar instances of lawyers misusing AI, Dutch lawyers have reportedly received warnings for such errors.
AI's integration into legal practice presents significant ethical and professional challenges, particularly concerning the verification of information. This case highlights the critical need for robust oversight mechanisms and continuous education for legal professionals on the responsible use of AI tools. Lawyers must maintain ultimate accountability for the accuracy and veracity of all submitted legal arguments and citations, regardless of the tools employed. The incident underscores the potential for AI to generate plausible-sounding but factually incorrect information, necessitating a heightened degree of diligence and critical assessment from practitioners to uphold the integrity of the judicial process and prevent the dissemination of misinformation.
AI-generated to prompt reflection — not editorial opinion, not advice, not a statement of fact. How this works.