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ChatGPT Reportedly Produced False Court Case Law Presented by Legal Counsel in Court

AI Incident Database · article · May 27, 2023 · UTC

A lawyer in Mata v. Avianca, Inc. used ChatGPT for research. ChatGPT hallucinated court cases, which the lawyer then presented in court. The court determined the cases did not exist.

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recordType
incident-report
evidenceStatus
reported
region
Global

Reported occurrence date: 2023-05-04T00:00:00.000Z

Evidence & attribution

AI Incident Database, Responsible AI Collaborative; McGregor (2021), Preventing Repeated Real World AI Failures by Cataloging Incidents. Incident-specific contributor credits are available at each citation link. Metadata adapted; article text excluded.

License: CC BY-SA 4.0

First collected: 2026-09-19T22:50:59.123Z. This is not the publication date.

Observed changes

AIIC observation times, not verified publisher revision times. Up to eight recent revisions.

2026-09-20T23:22:28.549Z

  • publishedAt: Not provided2023-05-27T00:00:00.000Z