Here is the SCOTUS decision in US v. Kebodeaux, No. 12-418:
The upshot is that here Congress did not apply SORNA to an individual who had, prior to SORNA’s enactment,been “unconditionally released,” i.e., a person who was not in “any . . . special relationship with the federal government,” but rather to an individual already subject to federal registration requirements that were themselves a valid exercise of federal power under the Military Regulation and Necessary and Proper Clauses. But cf. post, at 1 (SCALIA, J., dissenting). . . .
We conclude that the SORNA changes as applied toKebodeaux fall within the scope Congress’ authority underthe Military Regulation and Necessary and Proper Clauses. The Fifth Circuit’s judgment to the contrary is reversed,and the case is remanded for further proceedings consistentwith this opinion.
Justices Scalia and Thomas dissented.