Don Kettl is the Potomac Chronicle columnist for GOVERNING. He is the dean of the School of Public Policy at the University of Maryland and a nonresident senior fellow at the Brookings Institution. He authored several books, including "The Next Government of the United States and System Under Stress."
The United States isn't the only place where local marijuana policies clash with national laws. Even Amsterdam and the Dutch government have struggled with this tension. Read the rest of Governing's first-ever International Issue here.