This brief summarizes the efforts of states involved in the Justice Reinvestment Initiative (JRI), a program designed to identify and implement cost-efficient, evidence-based criminal justice reforms. To do so, jurisdictions use data analysis to identify criminal justice population and cost drivers and then develop policy options to reduce those drivers. The 17 states that have adopted the JRI model are projected to save $3.3 billion over 10 years. States plan to reinvest a share of these savings into high-performing public safety strategies.