Struck down a provision of the federal supervised-release statute, 18 U.S.C. section 3583(k). That section imposes mandatory minimum five-year sentences when a judge finds by a preponderance of the evidence that a defendant on supervised release committed one of several enumerated offenses, including possession of child pornography. Justice Gorsuch announced the judgment of the Court and delivered a plurality opinion on behalf of himself and three justices. Justice Breyer concurred in the judgment.