Impeachment by Prior Inconsistencies is a legal doctrine that allows a witness to be impeached by introducing evidence of earlier inconsistent statements made by the same witness. This doctrine is used to discredit the witness and challenge their credibility in the eyes of the court or jury. The primary types of Impeachment by Prior Inconsistencies are prior inconsistent statements, prior inconsistent behavior, and prior inconsistent writing. Prior inconsistent statements are when the witness has previously made statements that are contrary to their current testimony. Prior inconsistent behavior is when the witness has behaved in a way that contradicts their current testimony. Lastly, prior inconsistent writing is when the witness has previously written something that contradicts their current testimony. Impeachment by Prior Inconsistencies is an important legal doctrine that can be used to challenge the credibility of a witness in a court of law.