Every week, I receive letters from people across the country urging me to address issues involving state and local justice systems, about which there is often frustratingly little that anyone in the federal government can do. State and local officials are responsible for most policing issues, and they are in charge of the facilities that hold more than 90% of the prison population and the entire jail population. 45 × 45. Peter Wagner & Bernadette Rabuy, Mass Incarceration: The Whole Pie 2016 , P RISON P OL’Y (Mar. 14, 2016), https:///reports/ [ https:///N4WB-4T8C ].