Hallucinations & Sanctions

AI & Law, Hallucinations & Sanctions

Ko v. Li (2025 ONSC 2766) | AI Hallucination Legal Case

A Toronto family lawyer filed a factum containing AI-generated fake case citations in an Ontario Superior Court family law motion. The court issued a show cause order for contempt — the first in Ontario history over AI hallucinations — then dismissed it after the lawyer apologised and pledged CPD training, while ordering the client not be billed for the worthless research.

AI & Law, Hallucinations & Sanctions

Clinco v. Commissionner: AI Hallucination and Sanctions — USA Court Addresses AI tool Misuse in Legal Filings (2026)

A USA court addressed the use of AI tool in legal proceedings in Clinco v. Commissionner, examining whether AI-generated content in court submissions met professional standards. The decision adds to the growing body of case law holding lawyers accountable for unverified AI-generated citations and arguments.

AI & Law, Hallucinations & Sanctions

Zou v. Miracon Development: BC Supreme Court Flags AI Hallucinations in Self-Represented Litigants Costs Submissions (Jan 2026)

The British Columbia Supreme Court addressed AI hallucinations by self-represented plaintiffs in costs submissions following a successful civil judgment. The plaintiffs cited non-existent cases in their costs arguments, leading Justice Blok to address the AI-generated fabrications in a published costs judgment — one of the first Canadian provincial court decisions to do so.

Mata v Avianca ChatGPT AI hallucination lawyers sanctioned
AI & Law, Hallucinations & Sanctions

Mata v. Avianca | AI Hallucination Legal Case

A New York federal judge sanctioned attorneys from Mata v. Avianca after they cited six entirely fictitious ChatGPT-generated cases in a court filing — and then doubled down when challenged. The 2023 ruling by Judge Castel is the defining global precedent on AI hallucinations in legal practice, imposing financial penalties and requiring corrective filings from all counsel involved.

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