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147 Wis. 2d 240, 432 N.W.2d 913 (1988)
Summary
Generally, experts are prohibited from testifying as to the truthfulness of a witness. The fact-finder as the sole determiner of credibility.
See also: State v. Haseltine, 120 Wis. 2d 92, 352 N.W.2d 673 (Ct. App. 1984)
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