A Texas Subpoena (Criminal) is a legal document issued by a court or an officer of the court that requires a person to appear in court and provide testimony or documents relevant to a criminal case. There are two types of Texas Subpoena (Criminal): a Subpoena Ducks Cecum and a Subpoena Ad Testificandum. A Subpoena Ducks Cecum is a court order that requires a witness to appear in court and bring specified documents or other items for use as evidence. A Subpoena Ad Testificandum is a court order that requires a witness to appear in court and provide oral testimony. Both types of Texas Subpoena (Criminal) must be served in accordance with Texas law.