Sanction teardown · OLG Celle, Germany · 2025-04-29

Beschluss 5 U 1/25

What happened

In OLG Celle, Germany, a filing relied on an unnamed/unconfirmed AI tool to help draft legal argument. The court identified the following problems with the citations in that filing:

• Fabricated (Case Law)
  Defendant cited an OLG München decision (12.11.2015, 23 U 2003/15) which the court found to be a Fehlzitat and not retrievable on juris or beck-online.
• Fabricated (Case Law)
  Defendant cited an OLG Düsseldorf decision (13.04.2017, I-6 U 271/16) which the court found to be a Fehlzitat and not retrievable on juris or beck-online.
• Fabricated (Case Law)
  Defendant cited an OLG Koblenz decision (15.10.2020, 6 U 1261/19) which the court found to be a Fehlzitat and not retrievable on juris or beck-online.
• Fabricated (Case Law)
  Defendant cited an OLG Frankfurt decision (30.05.2018, 4 U 257/17) which the court found to be a Fehlzitat and not retrievable on juris or beck-online.

Which AI tool

an unnamed/unconfirmed AI tool. Note: Charlotin's public database records tool attribution only where a court order, brief, or reporting on the matter states it explicitly; "unidentified" or "implied" means the record indicates AI use but does not name a specific product — we do not guess.

Outcome

Court treated the cited authorities as Fehlzitate (not verifiable) and did not rely on them

How Citation Safe would have caught this

Citation Safe runs three deterministic layers before a brief is filed: (1) does the citation exist against CourtListener's database of published opinions, (2) if quoted, does that exact language appear in the source, (3) does the cited case actually support the proposition it is cited for. Fabricated case citations fail Layer 1. Fabricated or misattributed quotations fail Layer 2 even when the underlying case is real. Misrepresented holdings — a real case cited for a proposition it does not support — are the target of Layer 3. None of these checks involve asking another language model whether the citation looks right; they are lookups and text-matches against the actual source, which is why a hallucinated citation has to survive a direct lookup against the authoritative source — not another model's opinion — to earn a VERIFIED stamp; our measured false-verify rate is published live at /quality.

Check a brief before you file it → · See our live false-verify rate

Source: https://voris.wolterskluwer-online.de/browse/document/55ea1bb2-0c67-4731-8e65-0d75ddb8ad0c, via Damien Charlotin's public AI Hallucination Cases Database (CC0).