Impeachment
Challenging the credibility of a witness through prior inconsistent statements, bias, character for untruthfulness, or contradiction.
Impeachment methods include showing bias or motive to lie, sensory defects, prior inconsistent statements, a reputation/opinion for untruthfulness, certain criminal convictions, and contradiction by other evidence. Extrinsic evidence is barred for collateral matters but allowed for bias and other non-collateral impeachment.
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