Since 2006, more than 52,000 police guns were used in crimes across the U.S. In many cases, these weapons ended up in the hands of the general public in completely legal ways. Law enforcement agencies, including the Oregon State Police and the Portland Police Bureau, have sold or traded-in their firearms to gun stores or manufacturers in order to obtain newer models. Chris Hacker is an investigative data reporter with CBS News who reported on this trend in collaboration with The Trace and Reveal. He joins us to share more on their reporting.