The President wants to commute Federal drug prisoners, the key word being drug.
There probably would not be any problems letting marijuana users out early, what is the worst they would do, steal a bag of chips?
A crack user is another story, they would steal, rob, cheat and kill for a fix.
Cocaine users could be a problem depending on their experience with use of the drug.
Heroin users fall into the same category as crack users.
Met users should rot in prison.