According to Rule 608 of the Federal Rules of Evidence, which relates to evidence of character and conduct of a witness:

Question

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Rule 608 of the Federal Rules of Evidence allows for the credibility of a witness to be attacked or supported by evidence in the form of opinion or reputation, but only if subject to specific limitations. For instance, evidence of truthful character may be admissible even if the truthfulness has not been directly attacked, but evidence of specific instances of conduct may only be used to attack or support a witness’s credibility if they are probative of truthfulness or untruthfulness.