In this case, the Supreme Court case allowed bias as a permissible and established basis of impeachment under the Federal Rules of Evidence:

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United States v. Abel held that evidence of bias, including evidence of a witness's affiliation with groups demonstrating a proclivity for dishonesty, is admissible as it may affect the witness's credibility. This case specifically allowed the government to introduce evidence of a witness's membership in a group committed to lying and stealing to impeach the witness's credibility.

In This Case, the Supreme Court Case Allowed Bias as a Permissible