The New York Writ of Habeas Corpus Ad Testificandum is a court order issued by a judge to a jail or prison to bring a prisoner to court for a hearing. The writ is typically issued in cases where the prisoner is being held without due process or where the court has a need to examine the prisoner's testimony in order to decide a case. The writ is issued to the jail or prison and requires the prisoner to be brought before the court so that the prisoner may testify in court. There are two types of New York Writ of Habeas Corpus Ad Testificandum: 1) to bring the prisoner for an examination, and 2) to bring the prisoner for a trial. The writ for an examination is typically issued when a prisoner is held without due process and the court needs to examine the prisoner's testimony in order to make a decision. The writ for a trial is issued when a prisoner is to be tried in court and the court needs the prisoner to be present in order to testify.