Support WBURThe Difficulty Of Enforcing Laws Against Driving While HighPlay03:25Download AudioBen Markus, Colorado Public RadioStephanie O'Neill, KPCCSeptember 06, 2016 ShareAbby McLean of Northglenn, Colo., stands near the stretch of U.S. 85 in Adams County where she was pulled over for a DUI check in September 2014. (CPR News)
