The Illinois Amended Petition for Writ of Habeas Corpus -- Persons In State Custody is a legal document used to challenge the conviction or sentence of a person in state custody. This document allows individuals to challenge the constitutionality of their conviction or sentence and bring it before a court. It is commonly used when an individual believes they were wrongfully convicted or sentenced, or if they believe their sentence is too harsh. The Illinois Amended Petition for Writ of Habeas Corpus -- Persons In State Custody is divided into two types: the “Original Petition” and the “Amended Petition”. The Original Petition is used when the individual has not already filed a petition with the court. The Amended Petition is used when an individual has either already filed a petition or wishes to add additional information to their existing petition. Both types of petitions require detailed information about the individual's case, including the date of the conviction or sentencing, the court of conviction, the charges, and an explanation of the individual's claims of constitutional violation or excessive sentencing.