"If implemented, the package of policies outlined in the framework has the potential to generate significant savings in Idaho and estimates a 15-percent reduction in recidivism. By slowing the growth in the state prison population between 2015 and 2019, these policies will help the state avoid at least $288 million in construction and operating costs that would otherwise be needed to accommodate the forecasted growth. To achieve these outcomes, a portion of the expected savings must be reinvested in funding for training probation and parole officers, providing community-based treatment services to people on probation and parole supervision who are at a higher risk of reoffending, and implementing quality assurance measures." Sections of this report cover: overview of the data-driven justice reinvestment approach; summary of three challenges and related strategic policy solutions; justice reinvestment policy framework; projected impact of justice reinvestment policy framework on Idaho's prison population; reinvestment; Challenge 1-A Revolving Door and five related policy strategies to "strengthen supervision practices and programs to reduce recidivism"; Challenge 2-Insufficient Use of Prison Space and four related policy strategies to "tailor sanctions for supervision violations, provide recidivism outcomes at sentencing, and structure parole to make more productive use of prison space"; and Challenge 3-Insufficient Oversight and four related policy strategies to "access, track, and ensure impact of recidivism-reduction strategies".