There is no filing fee associated with this filing. Learn how a writ of habeas corpus can challenge unlawful detention, potentially reducing or overturning convictions even after appeals fail.A writ of habeas corpus stands as a vital legal tool, essential for safeguarding individual rights and averting arbitrary detention. A habeas corpus petition cannot act as a second direct appeal. The Habeas Corpus petition claims the arrest, sentence, or trial violated constitutional law, making imprisonment unlawful. The Writ of Habeas Corpus protects prison inmates from false imprisonment to ensure people are not thrown into jail unlawfully. A federal petition for habeas corpus is filed after a conviction and sentence in state court, and after appeals in state court. Petition For Writ Of Habeas Corpus Under 28 USC 2254 By A Person In State Custody Form. This is a California form and can be use in USDC Southern Federal. Fourth, the petition must include the correct constitutional claims and the detailed facts in support of those claims.