Texas Application For Writ of Habeas Corpus Ad Testificandum is a legal document used in Texas to request a court order to bring a prisoner before a court to testify or provide evidence in a legal proceeding. The writ is issued by a court to the custodian of the prisoner, such as the prison or jail, and requires the custodian to bring the prisoner to court for the hearing. There are three types of Texas writs of habeas corpus ad testificandum: writ of habeas corpus ad testificandum for a criminal case; writ of habeas corpus ad testificandum for a civil case; and writ of habeas corpus ad testificandum for a habeas corpus proceeding. The application must include the name of the petitioner, the name of the prisoner, the jurisdiction where the prisoner is held, and the reasons for the request. The writ must be signed by a judge and delivered to the custodian, who must then provide a copy to the prisoner and arrange for the prisoner's appearance in court.