Offender registration
Statute is not an unconstitutional regulation of purely intrastate commerce.
Statute requires timely registration when present in an area - acquisition of a domicile or extended habitation is not necessary.
Conversation in which US Marshall explained the registration requirement was not testimonial in nature, and therefore was not subject to Miranda.
http://www.ca5.uscourts.gov/opinions/pub/15/15-40370-CR0.pdf
Since 2011. An occasional commonplacing of the U.S. Circuit Courts of Appeal.
Neither an authoritative statement of the law nor legal advice. Quick work.