Lack of personal knowledge

Wis. Stat. § 906.02
in effect
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A witness may not testify to a matter unless evidence is introduced sufficient to support a finding that the witness has personal knowledge of the matter. Evidence to prove personal knowledge may, but need not, consist of the testimony of the witness. This rule is subject to the provisions of s. 907.03 relating to opinion testimony by expert witnesses.
Source: WI Statutes (Official Site)URL: https://docs.legis.wisconsin.gov/document/statutes/906.02Fetched: 10/7/2026