533US2 678 Unit: $U87 [10-21-02 18:35:10] PAGES PGT: OPIN OCTOBER TERM, 2000 Syllabus ZADVYDAS v. DAVIS et al. certiorari to the united states court of appeals for the fifth circuit No. 99–7791. Argued February 21, 2001—Decided June 28, 2001* After a final removal order is entered, an alien ordered removed is held in custody during a 90-day removal period. If the alien is not removed in those 90 days, the post-removal-period detention statute authorizes further detention or supervised release, subject to administrative review. Kestutis Zadvydas, petitioner in No. 99–7791—a resident alien born, apparently of Lithuanian parents, in a German displaced persons camp—was ordered deported based on his criminal record. Germany and Lithuania refused to accept him because he was not a citizen of their countries; efforts to send him to his wife’s native country also failed. When he remained in custody after the removal period expired, he filed a habeas action under 28 U. S. C. § 2241. The District Court granted the writ, reasoning that, because the Government would never remove him, his confinement would be permanent, in violation of the Constitution. In reversing, the Fifth Circuit concluded that Zadvydas’ detention did not violate the Constitution because eventual deportation was not impossible, good-faith efforts to remove him continued, and his detention was subject to administrative review. Kim Ho Ma, respondent in No. 00–38, is a resident alien born in Cambodia who was ordered removed based on his aggravated felony conviction. When he remained in custody after the removal period expired, he filed a § 2241 habeas petition. In ordering his release, the District Court held that the Constitution forbids post-removal-period detention unless there is a realistic chance that an alien will be removed, and that no such chance existed here because Cambodia has no repatriation treaty with the United States. The Ninth Circuit affirmed, concluding that detention was not authorized for more than a reasonable time beyond the 90-day period, and that, given the lack of a repatriation agreement, that time had expired. Held: 1. Section 2241 habeas proceedings are available as a forum for statutory and constitutional challenges to post-removal-period detention. Statutory changes in the immigration law left habeas untouched as the *Together with No. 00–38, Ashcroft, Attorney General, et al. v. Kim Ho Ma, on certiorari to the United States Court of Appeals for the Ninth Circuit.