USA: Peak of 7.3 million people in 2007 under adult correctional supervision: On probation or parole, or incarcerated in jail or prison. About 3.2% of the U.S. adult population, or 1 in every 31 adults. More info here. See template. Retrieved from "https://cannabis.wikia.org/wiki/Template:Timeline_USA._Prison,_jail,_probation,_parole?oldid=66786" Categories: Chart and graph templatesTimeshifter article templates Community content is available under CC-BY-SA unless otherwise noted.