Driving Stoned Bill Back Before Colorado Legislature

A marijuana blood limit for drivers is back before Colorado lawmakers, with special urgency now that the drug is legal for adults.

A bill in House Judiciary Committee Tuesday would set a blood-level limit for marijuana.

Similar proposals have failed three times before because of concerns that blood tests aren’t a fair way to tell whether someone is too stoned to get behind the wheel.

The bill under consideration would presume drivers are too stoned if their blood contains more than 5 nanograms of THC per milliliter. THC is the psychoactive ingredient in marijuana.