Cite as: 521 U. S. 346 (1997)
Opinion of the Court
that the individual is no longer dangerous or mentally impaired, we cannot say that it acted with punitive intent. We therefore hold that the Act does not establish criminal proceedings and that involuntary confinement pursuant to the Act is not punitive. Our conclusion that the Act is nonpunitive thus removes an essential prerequisite for both Hendricks' double jeopardy and ex post facto claims.
1
The Double Jeopardy Clause provides: "[N]or shall any person be subject for the same offence to be twice put in jeopardy of life or limb." Although generally understood to preclude a second prosecution for the same offense, the Court has also interpreted this prohibition to prevent the State from "punishing twice, or attempting a second time to punish criminally, for the same offense." Witte v. United States, 515 U. S. 389, 396 (1995) (emphasis and internal quotation marks omitted). Hendricks argues that, as applied to him, the Act violates double jeopardy principles because his confinement under the Act, imposed after a conviction and a term of incarceration, amounted to both a second prosecution and a second punishment for the same offense. We disagree.
Because we have determined that the Kansas Act is civil in nature, initiation of its commitment proceedings does not constitute a second prosecution. Cf. Jones v. United States, 463 U. S. 354 (1983) (permitting involuntary civil commitment after verdict of not guilty by reason of insanity). Moreover, as commitment under the Act is not tantamount to "punishment," Hendricks' involuntary detention does not violate the Double Jeopardy Clause, even though that confinement may follow a prison term. Indeed, in Baxstrom v. Herold, 383 U. S. 107 (1966), we expressly recognized that civil commitment could follow the expiration of a prison term without offending double jeopardy principles. We reasoned that "there is no conceivable basis for distinguishing the commitment of a person who is nearing the end of a penal
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