Final answer:
A prisoner's release, especially in terrorism or enemy combatant cases, must be approved by the federal court in the United States, as affirmed by Supreme Court rulings in Rasul v. Bush and Hamdi v. Rumsfeld.
Step-by-step explanation:
The release of a prisoner, particularly where it pertains to cases involving detention of terrorism suspects, writ of habeas corpus, or those who have been named enemy combatants, must be approved by a proper authority. In the United States, the habeas corpus right ensures that a prisoner has the right to appear in front of the federal court to challenge their detention.
This principle was affirmed in cases such as Rasul v. Bush and Hamdi v. Rumsfeld, where the Supreme Court ruled that even individuals held as enemy combatants are entitled to challenge their detainment before a neutral decision maker. In particular, U.S citizens must be given the opportunity to receive due process and to contest their enemy combatant status.