What Is Habeas Corpus? The writ of habeas corpus is the remedy to be used when any person is restrained in his liberty.In Texas, the state writ of habeas corpus is a legal mechanism that allows individuals to challenge their detention or imprisonment. A writ of habeas corpus is a legal tool that a person can use to enforce a superior right of possession to a child. An application for a writ of habeas corpus asks a court to overturn your conviction because of a state or federal constitutional violation. A Writ of Habeas Corpus (Latin for "that you have the body") may be filed on behalf of a person who is unlawfully imprisoned. A writ of habeas corpus is a legal tool used to enforce a superior right of possession to a child. A writ of habeas corpus requires that a person who is in custody be brought before a judge or court and that they be able to challenge that custody. Habeas corpus is a legal rule that requires a prisoner be presented in court and that the arrester prove that there is proper cause for detaining the prisoner. It's crucial to understand its role in the justice system.