17-03 Segment 1: Stoned Driving: How can police tell?

man making joint and a stash of marijuana in the car

 

With recreational marijuana use legal in eight states and 29 permitting medical pot use, there will be more drivers on the road who are potentially under the influence of marijuana. However, police have no way to determine who is dangerous and who is not, as blood levels of marijuana’s active ingredient are often meaningless. Experts discuss the problem and new scientific discoveries about marijuana impairment.

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