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Tribunal da Relacao de Guimaraes, 10 Feb 2026: six non-existent appellate rulings generated by AI

Guimaraes Court of Appeal (Tribunal da Relacao de Guimaraes)

last revised 2026-02-10last verified 2026-09-041 versioncountry page →

Judgment (guidance)In forceVerification duty

map categories:Duty to verify AI outputSanctions for AI misuse

Unverified: we have not yet opened the official document at the linked address. The record is listed for completeness and excluded from search indexes until confirmed.

In a criminal appeal concerning illegal weapons possession the defence cited excerpts from six Relacao and Supreme Court rulings that do not exist. The court called this absolutely inadmissible, explained AI hallucination, held legal professionals to a higher standard, ordered 5 UC in costs and suggested reporting the lawyer to the Ordem dos Advogados.

Applies to
lawyers, parties
Effective
See version history
Current version
Acordao 10 February 2026 · 10 Feb 2026
Last verified
04 Sept 2026
Official text
cnnportugal.iol.pt/inteligencia-artificial/tribunal/relacao-de-guimara…

What the document requires

  • Citing non-existent case law generated by AI is inadmissible and breaches professional duties.
  • Costs of 5 UC, about EUR 500, imposed on the appellant.
  • Referral to the Portuguese Bar Association suggested.

Version history

VersionDateWhat changedSource
Acordao 10 February 2026current2026-02-10Reported by CNN Portugal on 3 March 2026; official text not obtained.official

Sources

Cite this record

SafeLegalAI Legal AI Regulation Tracker, "Tribunal da Relacao de Guimaraes, 10 Feb 2026: six non-existent appellate rulings generated by AI" (Guimaraes Court of Appeal (Tribunal da Relacao de Guimaraes), Acordao 10 February 2026, 2026-02-10), safelegalai.com/regulation/other/pt-relacao-guimaraes-2026-acordaos-inexistentes (accessed 2026-09-04). Data: CC BY 4.0.

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