Include all of your grounds for relief and all of the facts that support each ground for relief in this petition. Notary fills out below.The CIU handles all post-conviction reviews, writs of habeas corpus, Chapter 64 motions, and clemency and commutation petitions. A writ of habeas corpus is based solely on the constitution and whether a sentence is unconstitutional. Federal habeas corpus is a procedure under which a federal court may review the legality of an individual's incarceration. A writ of habeas corpus is filed in the court that convicted the applicant. An application for a writ of habeas corpus must be made to the appropriate district court.