West Virginia Subpoena to Testify at a Hearing or Trial in a Criminal Case (AO 89) is a legal document issued by the court, often through the prosecutor, which orders an individual to appear and give testimony in a criminal trial or hearing. This document is used to ensure that all evidence is heard and considered by the court before a verdict can be reached. The West Virginia Subpoena to Testify at a Hearing or Trial in a Criminal Case (AO 89) may also be used to compel the attendance of witnesses to testify, or to produce any documents or other items that are relevant to the case. There are three types of West Virginia Subpoena to Testify at a Hearing or Trial in a Criminal Case (AO 89): a Subpoena Ducks Cecum, which orders the person to bring documents or other tangible items; a Subpoena Ad Testificandum, which orders the person to appear and testify; and a Subpoena Ad Testificandum et Ducks Cecum, which orders the person to appear and bring documents or other tangible items.