Marijuana, young drivers and serious car accidents are on a collision course. Fatal crashes involving drivers whose systems showed evidence of THC, the active ingredient in marijuana, nearly tripled in 10 years, rising from 4.2 percent in 1999 to 12.2 percent in 2010, according to a study released earlier this year by Columbia University's Mailman School of Public Health. In another four-year study, 43 percent of fatally injured drivers under 24 tested positive for cannabinoids. The percentage was lower for older age groups.
Now that marijuana is legal in Colorado and Washington and widely tolerated elsewhere in the U.S., parents may be on their own collision course with pot: They face steep car insurance hikes and even cancellation if young drivers on their policies are convicted of a DUI stemming from marijuana use. Here's what parents need to know about drugged driving and the effect it can have on insurance coverage.