Over the last few decades, the share of incarcerated people in U.S. state prisons serving long sentences has increased significantly—and it’s not necessarily keeping us safer, according to a new analysis by a nonpartisan criminal justice group. The Council on Criminal Justice (CCJ) found in a report published Tuesday that almost two-thirds (63%) of state prisoners were serving sentences of 10 years or more; that’s up from 46% in 2005.