Depending on the method of impeachment it may or may

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evidence to show that a witness lied on the stand. Depending on the method of impeachment, it may or may not be allowed. Methods of Impeachment 1) he has defects in perception, memory, or mental health -extrinsic evidence is allowed A. Defects in the five senses B. Influence of alcohol or drugs at time of occurrence C. Mental defect, abnormality, or disease 2) he is biased and wants one side to win (or really wants one side to lose) -extrinsic evidence is allowed Common sources of bias or interest: i) witness is a friend or relative of a party ii) witness bears a grudge against a party, iii) witness has a business relationship with a party ($$$)
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iv) witness testifying for the government wants leniency in a criminal case v) witness’ expenses (or expert fee) are being paid by a party vi) witness has been coached by a party or the party’s lawyer. 3) another witness’s story is more believable. (impeachment by contradiction). If witness X testifies that the light was red, and witness Y testifies that it was green, then witness X has been impeached by contradiction. Distinguish from self-contradiction. -extrinsic evidence is allowed if it is important (material) to the case Example: You testify that you observed the car accident while you were coming home from school. No extrinsic evidence (through
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