Here is the opinion in United States v. Voice.

An excerpt:

In addition to the due process contention previously discussed, Voice’s motion to dismiss the indictment argued that SORNA (1) does not apply to him because the Crow Creek Sioux Tribe has not implemented it, and (2) is  unconstitutional as applied to him because it violates the Ex Post Facto Clause, the non-delegation doctrine, and exceeds Congress’s power to regulate interstate commerce. On appeal, Voice acknowledges that we have recently decided these issues against him but argues the district court erred in denying his motion to dismiss on these grounds to preserve them for possible Supreme Court review. We agree these arguments are foreclosed by prior panel decisions.