533US2 692 Unit: $U87 [10-21-02 18:35:10] PAGES PGT: OPIN ZADVYDAS v. DAVIS Opinion of the Court cumstance present is the alien’s removable status itself, which bears no relation to a detainee’s dangerousness. Cf. id., at 358; Foucha, supra, at 82. Moreover, the sole procedural protections available to the alien are found in administrative proceedings, where the alien bears the burden of proving he is not dangerous, without (in the Government’s view) significant later judicial review. Compare 8 CFR § 241.4(d)(1) (2001) (imposing burden of proving nondangerousness upon alien) with Foucha, supra, at 82 (striking down insanity-related detention for that very reason). This Court has suggested, however, that the Constitution may well preclude granting “an administrative body the unreviewable authority to make determinations implicating fundamental rights.” Superintendent, Mass. Correctional Institution at Walpole v. Hill, 472 U. S. 445, 450 (1985) (O’Connor, J.); see also Crowell, 285 U. S., at 87 (Brandeis, J., dissenting) (“[U]nder certain circumstances, the constitutional requirement of due process is a requirement of judicial process”). The Constitution demands greater procedural protection even for property. See South Carolina v. Regan, 465 U. S. 367, 393 (1984) (O’Connor, J., concurring in judgment); Phillips v. Commissioner, 283 U. S. 589, 595–597 (1931) (Brandeis, J.). The serious constitutional problem arising out of a statute that, in these circumstances, permits an indefinite, perhaps permanent, deprivation of human liberty without any such protection is obvious. The Government argues that, from a constitutional perspective, alien status itself can justify indefinite detention, and points to Shaughnessy v. United States ex rel. Mezei, 345 U. S. 206 (1953), as support. That case involved a once lawfully admitted alien who left the United States, returned after a trip abroad, was refused admission, and was left on Ellis Island, indefinitely detained there because the Government could not find another country to accept him. The Court held that Mezei’s detention did not violate the Constitution. Id., at 215–216.