Longus v. U.S.: On Bias, Extrinsic Evidence, and the Collateral Fact Rule
Bias is “the powerful distorting effect on human testimony of the witness’s emotions or feelings towards the parties or the witness’ self-interest in the outcome of the case.” That is McCormick on Evidence, and it is the clearest, most accurate definition I have ever seen of what constitutes bias. McCormick continues: “[B]ias, or any acts, relationships, or motives reasonably likely to produce …