Hallucinated legal citations — Mata v. Avianca (2023)
An AI legal assistant cited six non-existent federal court cases in a brief filed before a federal judge. The attorney trusted the output without independently verifying the citations.
- Cost
- Sanctions, fines, reputational damage, disciplinary proceedings
- Root cause
- No provenance verification on generated citations
- The control
- A Decision Receipt with a source provenance chain — every citation must resolve to a real, hash-verified source before the output is admissible.