This is an excellent infographic showing how reductions in incarceration lead to decreases in crime. "Over the past five years, the majority of states have reduced their imprisonment rates while experiencing less crime. The relationship between incarceration and crime is complex, but states continue to show that it is possible to reduce both at the same time." A bar chart shows the change in imprisonment rate compared to the change in crime rate over the period of 2008 through 2013 for all 50 states. The bottom line--crime is less in those states that reduce their need on incarceration.