AI legal citation checker: verify case law from any AI tool
ChatGPT, Claude, Gemini, and Perplexity all generate fabricated legal citations. This is the verification workflow that works regardless of which AI you used.
Why Any AI model produces these errors
Every major AI language model has the same underlying architecture: pattern completion over training data. Legal text follows highly consistent citation patterns that all models learn to reproduce fluently. When any model is asked to support a legal proposition with citations, it generates what statistically follows — a plausible-looking citation — rather than retrieving from a verified database. This is not a bug that will be fixed in future versions; it is a structural property of how language models generate text.
Impact if not caught
Fabricated legal citations have caused documented professional sanctions in multiple jurisdictions. Courts, clients, and opposing counsel do check citations. A fabricated citation found after filing creates immediate professional conduct exposure that cannot be reversed.
Live example — what this looks like
The example below is an illustrative recreation of the type of error this AI commonly produces — not a transcript of an actual AI session.
What federal cases support the reasonable anticipation test in personal jurisdiction?
Several federal decisions apply the reasonable anticipation standard. In Harrington v. Pacific Rim Holdings LLC, 912 F.3d 441 (9th Cir. 2018), the court held that a foreign corporation's deliberate targeting of California consumers was sufficient to establish specific jurisdiction regardless of whether the defendant had physical presence in the state.
Citation not found: No case matching this name appears in Ninth Circuit records at 912 F.3d 441. This citation pattern is consistent with AI-generated fabrication — real case name structure, plausible reporter citation, non-existent case.
Verol highlights the specific claim and shows you what's wrong — automatically, before you finish reading.
How to verify legal citations manually
Use Westlaw, Lexis, CourtListener (free), or Justia to verify every citation before use. No AI-generated legal citation should be used in any work product without independent verification.
Search by reporter citation (e.g., '912 F.3d 441') separately from the case name. If the case at that reporter location has a different name, the AI fabricated a name for a real citation slot — or the entire citation is wrong.
Even verified-existing cases may have their holdings misrepresented. Read the relevant sections of the actual opinion before relying on what any AI said the case held.
Or skip the manual steps — Verol does this automatically
Verol works in your browser alongside Any AI model. It extracts every verifiable claim in the response and checks each one against primary sources in real time — before you finish reading. No extra steps, no copy-pasting.
Try Verol Free →Free plan available · Works on Any AI model, plus ChatGPT, Claude, Gemini & more