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. The writ of habeas corpus is the remedy to be used when any person is restrained in his liberty.This Chapter explains an important right—the writ of habeas corpus. 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 requires that a person who is in custody be brought before a judge or court and that they be able to challenge that custody. What Is Habeas Corpus? A writ of habeas corpus stands as a vital legal tool, essential for safeguarding individual rights and averting arbitrary detention. Habeas Corpus, in the Federal Court, is a petition that claims that you are being detained against your US constitutional rights. (The district clerk of the county of conviction will fill in this blank.) IN THE COURT OF CRIMINAL APPEALS OF TEXAS. It's crucial to understand its role in the justice system.