Government's premature concession that advisory sentencing guidelines residual clause was void for vagueness did not forfeit the claim, as it's a question of law, and the court can decide on its own.
Offense can be defined for purposes of modified categorical review by combining common law, state codes, and MPC.
Recklessness suffices for the mental state when categorizing manslaughter as a crime of violence.
Under modified categorical review, state manslaughter statute is a crime of violence, as even an omission can(?) require recklessness.
http://www.ca2.uscourts.gov/decisions/isysquery/c03aa681-4808-489f-8380-da2ee3800b29/2/doc/16-4129_opn.pdf#xml=http://www.ca2.uscourts.gov/decisions/isysquery/c03aa681-4808-489f-8380-da2ee3800b29/2/hilite/
