What are the cost savings from preventing a typical burglary, robbery, assault, or even a criminal career? Who benefits from these savings? How often do the benefits from preventing crime or criminal behavior exceed the resources spent on preventing or controlling crime? Is it more cost-effective to invest in early childhood programs or juvenile boot camps to reduce criminal offending? These are some of the important questions that face policymakers in crime and justice today. Answering them is no easy task. Nevertheless, it is important to provide answers in order to ensure that the dollars...

The United Kingdom has more than 4.2 million public closed-circuit television (CCTV) cameras-one for every fourteen citizens. Across the United States, hundreds of video surveillance systems are being installed in town centers, public transportation facilities, and schools at a cost exceeding $100 million annually. And now other Western countries have begun to experiment with CCTV to prevent crime in public places. In light of this expansion and the associated public expenditure, as well as pressing concerns about privacy rights, there is an acute need for an evidence-based approach to inform...