Don't quibble.
It is state law that mirrors the Fedaral statues in most cases. Just like the Arizona law. If anything the state narcotics laws are the unconstitutional ones becase not only do the mirror the Federal laws, the state is also trying the offenders while the immigrants are simple turned into the feds.
This "fills the field" nonsense is transparently a trap for liberals. It will essentially gut state civil rights laws as well. There is literally nothing that the Feds have the fingerprints on that the "fills the field" can't be applied to. This will go to the Supremes, and they will have a fielday with this amatuer nonsense. Talk about a lib judge chopping off his nose to spite his face