Cite as: 538 U. S. 84 (2003)
Opinion of Stevens, J.
Likewise, in Kansas v. Hendricks, 521 U. S. 346 (1997), the Court held that a law that permitted the civil commitment of persons who had committed or had been charged with a sexually violent offense was not an ex post facto law. But the fact that someone had been convicted was not sufficient to authorize civil commitment under Kansas law because Kansas required another proceeding to determine if such a person suffered from a " 'mental abnormality or personality disorder which makes the person likely to engage in the predatory acts of sexual violence.' " Id., at 352. Nor was the conviction even a necessary predicate for the commitment. See ibid. (Kansas' civil commitment procedures also applied to individuals charged with a sexually violent offense but found incompetent to stand for trial, or found not guilty by reason of insanity or by reason of mental disease or defect). While one might disagree in other respects with Hendricks, it is clear that a conviction standing alone did not make anyone eligible for the burden imposed by that statute.
No matter how often the Court may repeat and manipulate multifactor tests that have been applied in wholly dissimilar cases involving only one or two of these three aspects of these statutory sanctions, it will never persuade me that the registration and reporting obligations that are imposed on convicted sex offenders and on no one else as a result of their convictions are not part of their punishment. In my opinion, a sanction that (1) is imposed on everyone who commits a criminal offense, (2) is not imposed on anyone else, and (3) severely impairs a person's liberty is punishment.
It is therefore clear to me that the Constitution prohibits the addition of these sanctions to the punishment of persons who were tried and convicted before the legislation was enacted. As the Court recognizes, "recidivism is the statutory concern" that provides the supposed justification for the imposition of such retroactive punishment. Ante, at 105 (opinion in No. 01-729). That is the principal rationale that underlies the "three strikes" statute that the Court has up-
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