Holding: The Ninth Circuit lacked authority to hold that the requirements of the Sex Offender Registration and Notification Act (SORNA) violate the Constitution's Ex Post Facto Clause when applied to a juvenile who was adjudicated delinquent under the Federal Juvenile Delinquency Act before SORNA's enactment. At the time of the Ninth Circuit's decision, respondent's challenge was moot because the district court's order of juvenile supervision had expired, and respondent was no longer subject to the sex-offender-registration provisions that he challenged on appeal.
Judgment: Remanded with instructions to dismiss the appeal. in a per curiam opinion on June 27, 2011. Justices Ginsburg, Breyer, and Sotomayor would remand the case to the Ninth Circuit for that courtâ€™s consideration of mootness in the first instance. (Kagan, J., recused).