Impeachment Prior Conviction (Witness Other Than Defendant) is a legal term used to refer to the process of challenging the credibility of a witness in a criminal case by introducing evidence that the witness has been convicted of a prior crime. This type of impeachment is distinct from the impeachment of a defendant, which involves introducing evidence of the defendant's prior convictions. There are three main types of impeachment prior conviction (witness other than defendant): 1. Collateral Estoppel: This type of impeachment involves introducing evidence that the witness has already been found guilty of a crime in a prior case. This type of impeachment is used to demonstrate that the witness is not credible because they have been found guilty of a prior crime. 2. Similar Fact Evidence: This type of impeachment involves introducing evidence of a prior crime that is similar to the crime for which the witness is testifying. This type of impeachment is used to show that the witness is not credible because they have engaged in criminal activity similar to what is being alleged in the current case. 3. Character Evidence: This type of impeachment involves introducing evidence of the witness's character or reputation in order to show that they are not credible. This type of impeachment is used to demonstrate that the witness is not credible because their character and reputation suggest that they may be untruthful.