Legalized recreational marijuana raises a host of questions, including a major issue: how do police stop so-called drugged driving? To that end, Colorado this week unveiled a $1 million ad campaign to drive the point home that weed and automobiles dont mix. The Colorado Department of Transportation, which produced the ads with federal funding from the National Highway Transportation Safety Administration, is hoping to dispel notions that weed somehow enhances ones driving ability. According to the Associated Press, Colorado State Patrol has caught 61 drugged drivers since the beginning of the year, and 31 of those cases were tied to marijuana.