Sentencing -- Johnson's retroactivity on collateral review.
Second/successive Habeas petition challenging sentence imposed under ACCA residual clause permitted, as Supreme Court ruling holding the clause unconstitutionally vague was explicitly made retroactive for cases on collateral review.
http://www.ca6.uscourts.gov/opinions.pdf/15a0295p-06.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.