An Oklahoma Subpoena To Testify Criminal is a legal document issued by a court of law in the state of Oklahoma that requires someone to appear in court to testify as a witness in a criminal trial. This document is also referred to as a criminal subpoena or witness summons. It typically orders the witness to appear in court on a specific date and time and to bring any relevant documents or evidence with them. There are two types of Oklahoma Subpoena to Testify Criminal: a Subpoena Ducks Cecum, which requires the witness to bring certain documents or evidence to court; and a Subpoena Ad Testificandum, which requires the witness to appear in court to testify.