A witness is required to be cross-examined in a criminal trial to test his veracity; to discover who he is and what his position in life is; or to shake his credit, by injuring his character, although the answer to such questions may directly or indirectly incriminate him or may directly or indirectly expose him to a penalty or forfeiture (Section 146 of the Evidence Act). A witness is required to be cross- examined to bring forth inconsistencies, discrepancies and to prove the untruthfulness of the witness.[Para No.56]
It is open to an accused to raise such reasonable doubt by cross-examination of the prosecution witnesses to discredit such witness in respect of truthfulness and veracity. However, where the statement of prosecution witnesses cannot be doubted on the basis of the touchstone of truthfulness, contradictions and inconsistencies, and the accused wants to assert any particular fact which cannot be made out from the prosecution evidence, it is incumbent upon the accused to cross- examine the relevant witnesses to that extent. The witness, in order to impeach the truthfulness of his statement, must be cross- examined to seek any explanation in respect of a version, which accused wants to rely upon rather to raise an argument at the trial or appellate stage to infer a fact when the opportunity given was not availed of as part of fair play while appreciating the statement of the witnesses.