Understanding how law enforcement impacts population health is a complex but important effort. Nathan Rupert/Flickr A specific police action, an arrest or a shooting, has an immediate and direct effect on the individuals involved, but how far and wide do the reverberations of that action spread through the community? What are the health consequences for a specific, though not necessarily geographically defined, population? The authors of a new UW-led study looking into these questions write that because law enforcement directly interacts with a large number of people, “policing may be a conspicuous yet not-well understood driver of population health.”