Bills · 2025-2026 Regular Session
Relating to: admissibility of expert witness testimony.
- Introduced, completed
- Passes Senate, completed
- Passes Assembly, completed
- Governor signs, completed
- Law, completed
Unfamiliar terms? Glossary
What this bill does
Plain-language analysis by the nonpartisan Legislative Reference Bureau
This bill updates the current statutory rule of evidence relating to testimony by experts to conform with recent changes made to Federal Rule of Evidence (FRE) 702 intended to clarify the court’s gatekeeping role with respect to expert testimony. Current law parallels FRE 702 prior to its amendment, allowing the testimony of an expert witness if the witness’s scientific, technical, or other specialized knowledge will assist the trier of fact to understand the evidence or to determine a fact at issue in the case, but limiting the testimony of an expert witness to testimony that is based on sufficient facts or data, that is the product of reliable principles and methods, and that is based on the witness applying those principles and methods reliably to the facts of the case. Similar to the changes made to FRE 702, the bill confirms that the proponent of the testimony is required to demonstrate to the court that it is more likely than not that the witness’s testimony is based upon sufficient facts or data, that it is the product of reliable principles and methods, and, finally, that the witness’s opinion reflects a reliable application of those principles and methods to the facts of the case.
Sponsors
Registered lobbying interests · 7
Organizations that registered lobbying activity on this bill with the Wisconsin Ethics Commission. Registration means interest, not a position for or against. Official record
Votes
Senate: Report passage recommended by Committee on Judiciary and Public Safety, Ayes 8, Noes 0
Passed 8–0 Nov 12, 2025 official source full pageNo individual roll call was recorded for this vote. Committee votes and some older sessions record totals only.
Full history
- Oct 2, 2025 · Senate
Introduced by Senators Wanggaard, Feyen, Marklein and Wimberger; cosponsored by Representatives B. Jacobson, Kreibich, Moses, Murphy, Mursau, O'Connor, Penterman, Piwowarczyk, Tittl, VanderMeer, Wittke and Duchow
- Oct 2, 2025 · Senate
Read first time and referred to Committee on Judiciary and Public Safety
- Oct 22, 2025 · Senate
Public hearing held
- Nov 12, 2025 · Senate
Executive action taken
- Nov 12, 2025 · Senate
Report passage recommended by Committee on Judiciary and Public Safety, Ayes 8, Noes 0
- Nov 12, 2025 · Senate
Available for scheduling
- Nov 14, 2025 · Senate
Placed on calendar 11-18-2025 pursuant to Senate Rule 18(1)
- Nov 18, 2025 · Senate
Read a third time and passed
- Nov 18, 2025 · Senate
Ordered immediately messaged
- Nov 18, 2025 · Senate
Read a second time
- Nov 18, 2025 · Senate
Ordered to a third reading
- Nov 18, 2025 · Senate
Rules suspended to give bill its third reading
- Nov 19, 2025 · Assembly
Received from Senate
- Jan 16, 2026 · Assembly
Read first time and referred to committee on Rules
- Jan 20, 2026 · Assembly
Placed on calendar 1-22-2026 by Committee on Rules
- Jan 22, 2026 · Assembly
Rules suspended to withdraw from calendar and take up
- Jan 22, 2026 · Assembly
Read a second time
- Jan 22, 2026 · Assembly
Ordered to a third reading
- Jan 22, 2026 · Assembly
Rules suspended
- Jan 22, 2026 · Assembly
Read a third time and concurred in
- Jan 22, 2026 · Assembly
Ordered immediately messaged
- Jan 22, 2026 · Senate
Received from Assembly concurred in
- Jan 28, 2026 · Senate
Report correctly enrolled
- Mar 5, 2026 · Senate
Presented to the Governor on 3-5-2026
- Mar 9, 2026 · Senate
Report approved by the Governor on 3-6-2026. 2025 Wisconsin Act 92
- Mar 9, 2026 · Senate
Published 3-7-2026