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Ústavní soud, usnesení sp. zn. I. ÚS 3004/25 — procedural fine for a constitutional complaint citing non-existent decisions

Constitutional Court of the Czech Republic [Ústavní soud]

last revised 2025-12-01last verified 2026-09-041 versioncountry page →

Judgment (guidance)In forceVerification duty

map categories:Sanctions for AI misuseDuty to verify AI output

The Czech Constitutional Court fined counsel Mgr. Pavel Kehl CZK 25,000 over a constitutional complaint citing decisions that did not exist or whose holdings were grossly misdescribed. The court identified anglicisms, sentence fragments and inconsistent citation formatting as indicators of AI drafting, and held counsel fully responsible for hallucinated arguments.

Applies to
lawyers
Effective
See version history
Current version
1.0 · 01 Dec 2025
Last verified
04 Sept 2026
Official text
nalus.usoud.cz/Search/GetText.aspx?sz=1-3004-25_1

What the document requires

  • Cited authorities including III. ÚS 2987/18, III. ÚS 3881/18 and II. ÚS 2264/14 either did not exist or were grossly misinterpreted.
  • Indicators of AI generation: anglicisms, incomplete sentence fragments, inconsistent citation formatting and confusion between decision types.
  • A lawyer bears full responsibility for every argument in a filing, including any hallucinating arguments produced by artificial intelligence.
  • The CZK 25,000 fine was a quarter of the CZK 100,000 statutory maximum, reflecting a first offence and the remediable nature of the defects.

Version history

VersionDateWhat changedSource
1.0current2025-12-01Decision imposing a CZK 25,000 procedural fine on counsel.official

Sources

Cite this record

SafeLegalAI Legal AI Regulation Tracker, "Ústavní soud, usnesení sp. zn. I. ÚS 3004/25 — procedural fine for a constitutional complaint citing non-existent decisions" (Constitutional Court of the Czech Republic [Ústavní soud], 1.0, 2025-12-01), safelegalai.com/regulation/other/cz-usoud-i-us-3004-25-fabricated-citations (accessed 2026-09-04). Data: CC BY 4.0.

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