Are you high? The science of testing for marijuana impairment is hazy, and evolving Lawmakers, police, prosecutors grapple with how to define marijuana impairment. District 3 police officer Michael Davis, left, talks with Corporal David Trujillo Denver Police Traffic Operations Bureau DUI/DRE as he begins an investigation of a one car accident where the driver is suspected to be under the influence at the Denver Health Medical Center

2017-08-27