By Cynthia Lum, Christopher S. Koper, Hyunji Lee, Daniel S. Nagin, Lawrence Sherman

Research Question Can research discover the true cost-effectiveness of new technologies in policing, such as automatic license plate readers (ALPR)? Data We review the findings of many impact tests of introducing ALPR readers in predominantly US police agencies. Methods We place the data in the context of the two key police mandates: public safety and public confidence. We then apply the logic of linking findings specific to the new technology with the two broad mandates. Findings The effect of any technology on police outcomes depends heavily on how it is implemented in the larger context of organizational systems and culture. The effect is also conditioned by a broad body of evidence that the key mandates depend on far broader foundations than on any specific technology. Conclusions Evidence-based policing cannot be built from isolated findings, such as marginal changes in outputs or outcomes associated with new technologies. Linking new technologies to joined-up systems of targeting, testing, and tracking is required before we can ask whether the technologies are cost-effective.

Cambridge Journal of Evidence-Based Policing (2025)

By Stephen Farrall, Jason Warr, Abigail Shaw, Kanupriya Sharma

This paper reviews what is known about ethnic identity and the processes by which people cease offending. Whilst the past 30 years have seen dramatic growth in what is known about desistance, in many jurisdictions, there is a paucity of research which examines this in terms of ethnicity or ethnic variations. We therefore review what is empirically known about ethnicity and desistance. Whilst this review draws from the global literature, our focus is on what this literature tells us about ethnicity and desistance from a British perspective. We find that the majority of these have been undertaken in the United States (although there are some European and Australasian studies). Few studies, however, have fully unpacked the role of racism (in terms of institutional processes or overt prejudice and hostility) and that there have been very few studies of the roles played by ethnicity in processes of desistance.

The Howard Journal of Crime and JusticeVolume 64, Issue 3Sep 2025