The Writ of Habeas Corpus demands that requires a prisoner must go before the court to determine if there is lawful authority to detain the prisoner. Who May Use This Form.A writ is basically an order from the judge directing the government (or sometimes a lower court) to do something. A Writ of Habeas Corpus is a motion which is filed most frequently to ensure that a Defendant's imprisonment or detention is not illegal. A writ of habeas corpus is a legal rule that gives a prisoner the right to request court assistance and show that they've been wrongfully imprisoned. The writ of habeas corpus is often called the 'great writ' because of its importance in safeguarding individual freedom. Largest forms database in the USA with more than 80,000 federal, state and agency forms. The "Great Writ" of habeas corpus is a fundamental right in the Constitution that protects against unlawful and indefinite imprisonment. STEP 2: Fill out the "Summons" form. Detained at the Maricopa County Durango Jail in Phoenix, Arizona, pending trial on state criminal charges.