Fourth Circuit: US v. Daniel Sanchez

When a deft elects not to challenge an almost-completed sentence by Habeas, a challenge to the imposition of additional time after revocation of supervised release cannot be raised on the grounds that the original sentence was unconstitutional, as statute requires such challenges to be made by direct appeal or collateral challenge.

http://www.ca4.uscourts.gov/opinions/174169.P.pdf