There is a chart here that is helpful in understanding the total number of people who are impacted by different parts of the criminal justice system. Approx 70% of people in local jails are there for non-violent offenses, approx 45% of people in state prisons are there for non-violent offenses and approximately 94% of people in the federal system are there for non-violent offenses. https://www.prisonpolicy.org/reports/pie2018.html