How dangerous people get their weapons in America
Attendees visit the trade booths during the National Rifle Association's annual meeting in Louisville, Kentucky, May 21, 2016. REUTERS/Aaron P. Bernstein

By Philip Cook, Professor of Public Policy Studies, Duke University. The recent mass shooting in Las Vegas that left dozens of people dead and hundreds injured raises two important questions: How do dangerous people get their guns? And what should the police and courts be doing to make those transactions more difficult? The fact is that,…