What Is Impeachment Evidence?

In criminal cases, lawyers use various types of evidence to question the accuracy of witnesses’ testimony. The process is called impeachment. Various different kinds of impeachment evidence may show that a witness is not being truthful, such as if prior statements to the police contradict testimony on the stand, or that a witness was not able to observe what happened, such as if the witness has poor vision. Oklahoma law permits lawyers to use specific types of evidence for impeachment purposes. Lawyers may question the witness they are trying to impeach, or they may question a different person to impeach a...

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