Kestutis Zadvydas, born in a displaced-persons camp in Germany to Lithuanian parents, was lawfully admitted to the United States but never became a citizen of any country. After multiple criminal convictions, the former Immigration and Naturalization Service (INS) ordered him removed. Under 8 U.S.C. § 1231(a)(1), the government has a 90-day "removal period" to execute a removal order, during which detention is mandatory. When the INS could not remove Zadvydas because no country would accept him—Germany and Lithuania declined, and he was effectively stateless—it continued to detain him under § 1231(a)(6), which authorizes detention beyond the 90-day period. Zadvydas filed a federal habeas petition under 28 U.S.C. § 2241 challenging his continued confinement as unlawful. His case was considered alongside a companion case involving Kim Ho Ma, a Cambodian national ordered removed to a country with which the United States then had no repatriation agreement. Lower courts split on whether § 1231(a)(6) permits potentially indefinite civil detention; the Fifth Circuit upheld broad detention authority, while the Ninth Circuit limited it. The Supreme Court granted certiorari to resolve the interpretive question and its constitutional implications.
Does 8 U.S.C. § 1231(a)(6) authorize the government to detain a noncitizen with a final order of removal for an indefinite period when there is no significant likelihood of removal in the reasonably foreseeable future, consistent with the Fifth Amendment's Due Process Clause?
Interpreting 8 U.S.C. § 1231(a)(6) to avoid serious constitutional concerns, the statute authorizes detention only for a period reasonably necessary to secure the noncitizen's removal. There is a presumptively reasonable six-month detention period following the removal order. After six months, if the noncitizen provides good reason to believe that there is no significant likelihood of removal in the reasonably foreseeable future, the government must respond with sufficient evidence to rebut that showing; if it cannot, the noncitizen must be released under supervision pursuant to § 1231(a)(3). Dangerousness alone does not justify continued detention absent a realistic prospect of removal.
No. Section 1231(a)(6) does not permit indefinite detention. Detention is limited to the period reasonably necessary to effect removal, presumptively up to six months. If, after six months, there is no significant likelihood of removal in the reasonably foreseeable future, the government must release the noncitizen under supervision.
The Court, in a 5–4 opinion by Justice Breyer, began with statutory interpretation. Section 1231(a)(6) provides that certain categories of noncitizens "may be detained beyond the removal period" but is silent on duration. Reading the provision to authorize potentially permanent detention would raise a serious constitutional question under the Fifth Amendment because admitted noncitizens enjoy substantial due process protection against arbitrary confinement. Civil detention is constitutionally permissible only insofar as it bears a reasonable relation to its purpose—here, effectuating removal and preventing flight while removal is pursued. Where removal is not reasonably foreseeable, continued detention ceases to serve those purposes and becomes punitive in effect. Employing the canon of constitutional avoidance, the Court construed § 1231(a)(6) to contain an implicit reasonableness limitation. It established a procedural framework: a presumptively reasonable six-month period of post-removal-order detention. After six months, the noncitizen may secure release by providing "good reason to believe" that removal is not significantly likely in the reasonably foreseeable future. The burden then shifts to the government to rebut with evidence that removal is likely soon. Dangerousness or prior criminality does not, by itself, authorize continued detention under § 1231(a)(6) without a realistic prospect of removal. The Court distinguished Shaughnessy v. United States ex rel. Mezei, which concerned an "excludable" (unadmitted) noncitizen stopped at the border, explaining that Zadvydas and his companion were admitted to the country and thus entitled to stronger due process protections. The Court emphasized it was deciding the case on statutory, not constitutional, grounds, though constitutional concerns animated the construction. It noted that Congress retains power to craft specific detention authorities for special circumstances, but such authority was not evident in § 1231(a)(6) as enacted. Dissenting opinions argued that the statute's text allowed continued detention and that the majority improperly rewrote the statute. They also maintained that national sovereignty and plenary power over immigration supported broader detention authority and that the constitutional avoidance canon was misapplied.
Zadvydas is a foundational case on the limits of civil immigration detention. For law students, it demonstrates the power of the constitutional avoidance canon, the due process constraints on civil confinement of admitted noncitizens, and the Court's insistence that detention be closely tethered to its nonpunitive purpose. Practically, the decision created a six-month benchmark and a burden-shifting mechanism that govern post-removal-order custody reviews and habeas litigation. The case also sets up later doctrinal development: in Clark v. Martinez (2005), the Court applied the same reading of § 1231(a)(6) to inadmissible (unadmitted) noncitizens, ensuring uniform application of the statute's meaning across categories.
Zadvydas v. Davis anchors the principle that civil immigration detention must be rationally related to its purpose and cannot persist when removal is not reasonably foreseeable. By construing § 1231(a)(6) to impose a reasonableness limit and a six-month presumption, the Court constrained executive detention authority while preserving Congress's prerogative to enact specific detention frameworks for exceptional cases.