366
Opinion of the Court
may be a legitimate end of the civil law. See Allen, supra, at 373; Salerno, 481 U. S., at 748-749. Accordingly, the Kansas court's determination that the Act's "overriding concern" was the continued "segregation of sexually violent offenders" is consistent with our conclusion that the Act establishes civil proceedings, 259 Kan., at 258, 912 P. 2d, at 136, especially when that concern is coupled with the State's ancillary goal of providing treatment to those offenders, if such is possible. While we have upheld state civil commitment statutes that aim both to incapacitate and to treat, see Allen, supra, we have never held that the Constitution prevents a State from civilly detaining those for whom no treatment is available, but who nevertheless pose a danger to others. A State could hardly be seen as furthering a "punitive" purpose by involuntarily confining persons afflicted with an untreatable, highly contagious disease. Accord, Compagnie Francaise de Navigation a Vapeur v. Louisiana Bd. of Health, 186 U. S. 380 (1902) (permitting involuntary quarantine of persons suffering from communicable diseases). Similarly, it would be of little value to require treatment as a precondition for civil confinement of the dangerously insane when no acceptable treatment existed. To conclude otherwise would obligate a State to release certain confined individuals who were both mentally ill and dangerous simply because they could not be successfully treated for their afflictions. Cf. Greenwood v. United States, 350 U. S. 366, 375 (1956) ("The fact that at present there may be little likelihood of recovery does not defeat federal power to make this initial commitment of the petitioner"); O'Connor v. Donaldson, 422 U. S. 563, 584 (1975) (Burger, C. J., concurring) ("[I]t remains a stubborn fact that there are many forms of mental illness which are not understood, some which are untreatable in the sense that no effective therapy has yet been discovered for them, and that rates of 'cure' are generally low").
Alternatively, the Kansas Supreme Court's opinion can be read to conclude that Hendricks' condition is treatable, but
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