Data Source: Data compiled by the Prison Policy Initiative from publicly available available sources and FOIA request responses. Data collection dates and definitions of "probation or parole holds" vary by jurisdiction. See details at https://www.prisonpolicy.org/blog/2020/03/18/detainers/. (Graph: Wendy Sawyer, 2020)
This graph originally appeared in Technical violations, immigration detainers, and other bad reasons to keep people in jail.