 Therefore, if a detainee wishes to challenge the legality of his detention, he must apply for an order for review of detention (formerly known as a writ of "habeas corpus") under the civil procedure of the Supreme Court.However, it is not within the court's province to determine that a detainee should be charged and tried in open court rather than be detained.In 1967, there were 620 people detained and 720 people subject to police supervision under the Act.