This research considers the adoption, design, implementation, and oversight of digital surveillance technologies in the daily and critical functions of the Belleville Police Department. This agency has custom designed and implemented a digital surveillance and data management system which has since been adopted by forty police departments across its state—including the State Police; moreover, Belleville's data systems interface with the principal national and state-level criminal justice databases, as well as with data sources external to the criminal justice system. The agency provided, to the extent permissible by law, complete access to the agency's employees and systems, as well as all available historical data and records relating to the creation and development of the system. The researcher collaborated with the agency's employees in an extended ethnographic study of their digital surveillance technologies and processes in order to empirically assess associated potential and actual harms, issues, problems, and vulnerabilities. This study concludes by proposing ways that harm reduction models, such as Situational Crime Prevention, can be applied to digital surveillance technologies to improve oversight and accountability.