Impact of legal marijuana on driving in Maryland is tough to gauge, and enforcing impaired driving laws is complicated

At the end of June, as many Marylanders eagerly anticipated buying recreational marijuana legally for the first time, Sgt. Thomas Morehouse was worried about the safety of Baltimore County’s roads. Morehouse, a certified drug recognition expert for the Baltimore County Police Department, was concerned about residents lighting up and then getting behind the wheel after July 1.