Which Parts of an Expert's ChatGPT History Related to Preparing Expert Report Must Be Disclosed?
By Eugene Volokh · Oct 1, 2026, 12:28 PM CDT
From Judge Anne Traum (D. Nev.) Monday in Villanueva v. Las Vegas Metro. Police Dep't (the underlying lawsuit alleges a jail corrections officer abused plaintiff when plaintiff was arrested): Plaintiff Jose Villanueva sued Defendants Francis Soriano and the Las Vegas Metropolitan Police Department ("LVMPD"), for violations of state and federal law that occurred while he was detained at Clark Count
Excerpt shown under fair-use limits. Full text remains with the original publisher.
People in this coverage
Explore their history and attributable record. Being mentioned does not imply endorsement.
Layer 1 · Claims & fact checks
AI analysisLayer 3 · Reporting analysis
AI analysisLegal Authority CitationThe article invokes appellate precedent to bolster the court’s broad interpretation of “facts or data.”
FramingThe narrative frames the decision as a balanced carve‑out, emphasizing both disclosure and privilege.
Privilege EmphasisThe article stresses the protection of mental impressions to justify non‑disclosure of certain log entries.
Policy ImplicationThe piece suggests that disputes over AI‑assisted methodology are better resolved at trial, not through discovery.
Context
AI analysisMissing context
The article does not provide information about how other circuits have ruled on AI‑generated research, any appellate history of this specific decision, or the broader policy debate on AI‑assisted expert work product.
Important context
Rule 26(a)(2)(B)(ii) requires disclosure of the facts or data an expert considered, while Rule 26(b)(3)(A) and 26(b)(4)(B) protect mental impressions, conclusions, and draft materials. The Ninth Circuit has interpreted “facts or data” broadly to include any material the expert considered, even if only consulted as a quick‑reference guide.
Opinion vs. reporting
AI analysisThe piece primarily reports the court’s ruling but includes interpretive commentary on why certain parts of the log are privileged, reflecting the author’s legal analysis rather than pure factual reporting.