Wisconsin Statutes

Wis. Stat. § 907.05 (2026)

Disclosure of facts or data underlying expert opinion

✓ current as of July 2026

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907.05907.05 Disclosure of facts or data underlying expert opinion. The expert may testify in terms of opinion or inference and give the reasons therefor without prior disclosure of the underlying facts or data, unless the judge requires otherwise. The expert may in any event be required to disclose the underlying facts or data on cross-examination.

907.05 HistoryHistory: Sup. Ct. Order, 59 Wis. 2d R1, R213 (1973); 1991 a. 32.

Notes of Decisions

Cited in 4 cases (3 in the last 5 years), 2020–2023 · leading case: State v. Oscar C. Thomas, 2021 WI App 55 (Wis. Ct. App. 2021).

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State v. Oscar C. Thomas, 2021 WI App 55 (Wis. Ct. App. 2021). · cites it 5× “However, the court observed that pursuant to § 907.05, the adverse party may have the expert witness explain the underlying assumptions and data for his or her opinion.”

State v. Oscar C. Thomas, 2023 WI 9 (Wis. 2023). · cites it 2× “3After all, experts may rely on inadmissible evidence, including hearsay, in forming their opinions.”

Kenneth J. Stankowski v. City of Wausau (Wis. Ct. App. 2023). · cites it 2× “§ 907.05 (stating that an expert witness may be required to disclose facts or data underlying his or her opinion on cross-examination).”

Avonelle M. Kissack Living Trust v. Am. Transmission Co., LLC (Wis. Ct. App. 2020). “§ 907.05 nor … § 907.03 licenses the proponent to disclose inadmissible bases during direct examination”).”

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