Texas Application for Subpoena — Civil is a form used by Texas courts to issue a legal order, or subpoena, requiring someone to appear in court to provide testimony or produce documents or other evidence. There are three types of Texas Application for Subpoena — Civil: SubpoenDuckseCecumum, Subpoena Ad Testificandum, and Subpoena Ad Testificandum Come Ducks Cecum. The Subpoena Ducks Cecum requires the recipient to appear in court to provide documents or other tangible evidence. The Subpoena Ad Testificandum requires the recipient to appear in court to give testimony. The Subpoena Ad Testificandum Come Ducks Cecum requires the recipient to appear in court to provide documents or other tangible evidence and to give testimony. The Texas Application for Subpoena — Civil must be completed in accordance with the rules of civil procedure in Texas and is typically issued by a court clerk.