1.15 Impeachment of Witness-Convictions is a legal process in which a witness's credibility is challenged and their testimony is put into question. This is done by introducing evidence which casts doubt on the witness's reliability, such as evidence of bias, prior inconsistent statements, or evidence of a criminal record. There are three main types of impeachment of witness-convictions: direct, collateral, and extrinsic. Direct impeachment involves challenging the witness's testimony by presenting evidence that contradicts it. Collateral impeachment involves introducing evidence of bias or motive to discredit the witness. Extrinsic impeachment involves introducing evidence of a witness's prior criminal record or other bad acts.