A Tennessee Deposition Subpoena in a Criminal Case (AO-90) is a document issued by a court of law, requiring an individual to appear as a witness at a deposition. The subpoena is served on a witness to compel their testimony in criminal proceedings. It is a form of legal process used to acquire evidence and testimony from a witness during a criminal case. There are two types of Tennessee Deposition Subpoena in a Criminal Case (AO-90). The first type of subpoena is the Criminal Deposition Subpoena (AO-90) which requires a witness to appear and testify before the court. The second type is the Criminal Deposition Subpoena Ducks Cecum (AO-90) which requires the witness to bring documents, records, or other materials to the deposition. Both types of subpoenas are used to obtain evidence for use in criminal proceedings.