Witness credibility evidence cannot contradict answers on character, except for prior convictions, impartiality challenges, or material factual contradictions.

Section 153 restricts extrinsic evidence used to contradict a witness's answers to questions relevant only for shaking credibility by injuring character. Contrary evidence is generally excluded after such an answer, though a false answer may expose the witness to a charge of giving false evidence. Contradiction remains permissible for denied previous convictions, facts impeaching impartiality, or material facts in issue rather than mere character or credit.

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