As of 2006, 49.3% of state prisoners, or 656,000 individuals, were incarcerated for non-violent crimes.
By 2010, drug offenders in federal prison had increased to 500,000 per year, up from 41,000 in 1985. Drug related charges accounted for more than half the rise in state prisoners. 31 million people have been arrested on drug related charges, approximately 1 in 10 Americans.
https://en.wikipedia.org/wiki/United_States_incarceration_ra...