"More than half (53%) of state prisoners were serving sentences for violent offenses in 2014 (the most recent year for which offense data are available), compared to 19% for property offenses and less than 16% for drug crimes."
Also to parent's point:
"Almost 7% of state prisoners (91,300 inmates) and 18% of federal prisoners (34,900) were held in private prison facilities in 2015"
The evil corporate private prisons trapping the poor pot smokers to extract money from them is a nice fairy tale. The reality is more complicated and forces us to grapple with the fact that there are some pretty bad people out there, and we're apparently OK with treating them inhumanely when we seek retribution.