DNA databases have become essential for solving crimes with few to no leads. But their benefits extend beyond finding suspects.  They provide a powerful tool for preventing crimes from happening in the first place, according to a paper in the American Economic Journal: Applied Economics. Authors Anne Sofie Tegner Anker, Jennifer L. Doleac, and Rasmus Landersø found that the expansion of DNA databases in Denmark led to a sharp reduction in recidivism. While some citizens worry about potential abuse of this surveillance tool, the effectiveness of registering offenders in DNA databases stands out compared to traditional policing measures. Professor Doleac recently spoke with Tyler Smith about how DNA registration deters crime and how policymakers should weigh the tradeoff between privacy and effective policing measures.