Wisconsin Statutes Evidence (Ch. 901 to 937) § 906.08. Evidence of character and conduct of witness

(1) Opinion and reputation evidence of character.Except as provided in s. 972.11(2), the credibility of a witness may be attacked or supported by evidence in the form of reputation or opinion, but subject to the following limitations:

(2) Specific Instances of Conduct. Specific instances of the conduct of a witness, for the purpose of attacking or supporting the witness’s character for truthfulness, other than a conviction of a crime or an adjudication of delinquency as provided in s. 906.09, may not be proved by extrinsic evidence. They may, however, subject to s. 972.11(2), if probative of truthfulness or untruthfulness and not remote in time, be inquired into on cross-examination of the witness or on cross-examination of a witness who testifies to his or her character for truthfulness or untruthfulness.

(3) Testimony by accused or other witnesses. The giving of testimony, whether by an accused or by any other witness, does not operate as a waiver of the privilege against self-incrimination when examined with respect to matters which relate only to character for truthfulness.