"Percival (San José State Univ.) takes readers on a journey informed by a political science approach to understand how the US has gone from the wars on crime and drugs that led to mass incarceration to what is now termed a 'smart on crime' approach aimed at evidence-based policies and decarceration. Percival rejects as too simplistic the idea that economics has driven this new approach to criminal justice in favor of a more nuanced explanation that examines the political coalitions that have emerged because of a convergence of a number of driving factors. He largely credits conservative politicians and their allies with guiding the 'smart on crime' movement. His method is to conduct a policy history of past 'tough on crime' policies, a current legislative history of the Second Chance Act and the Fair Sentencing Act of 2010, and an assessment of policies in three states—Ohio, Texas, and California—to support his contention that conservatives have played a pivotal role in advancing policies that focus on evidence-based rehabilitation policies and fiscal restraint. Summing up: Recommended. Upper-division undergraduate, graduate, and research collections."—S. E. Blankenship, Lake Erie College, Painesville, Ohio, USA, for CHOICE, March 2016