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.
Wis. Stat. § 906.02
Lack of personal knowledge
Applied in 6 court decisions — leading case PALISADES COLLECTION LLC v. Kalal (2010)
Most recently applied in 383 Wis. 2d 784 - State v. Baumann (July 2018)
Sup
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Official source: Wisconsin State Legislature. Reproduced from public-domain Wisconsin statutes; confirm against the official source for the current text. Not legal advice.