Martin Kaste is a correspondent on NPR's National Desk. He covers law enforcement and privacy. He has been focused on police and use of force since before the 2014 protests in Ferguson, and that coverage led to the creation of NPR's Criminal Justice Collaborative.
North Korea has reportedly sent balloons carrying trash and excrement into South Korea. NPR's Scott Simon has details — smelly and otherwise — on how both countries have used balloons over the years.