Driving while high: Wayne State professor works to find legal limit for marijuana

According to Michigan State Police, more drivers involved in crashes, even deadly ones, are testing positive for cannabinoid drugs. In early January, a 15-year-old boy was killed in Shelby Township by a driver that we're told reeked of marijuana. Police say too often, people don't realize the hazards of driving while high. "A lot of people have the perception that if it's legal, it's OK. Well, it's OK to smoke, it's just not OK to drive while you are under the influence of smoking," Lt. Derek Lindsay of the Monroe Police Department said.