Marijuana DUI Bill Back Before Colorado Senate

DENVER (AP) - A divisive proposal to set a marijuana blood standard for drivers is back before the Colorado Senate, which rejected the idea last year.

The Senate was scheduled to debate a bill that says drivers would be considered impaired if they test positive for 5 nanograms or more of THC, the psychoactive ingredient in marijuana, per milliliter of blood. Some dispute whether a blood THC test is a fair gauge of whether a driver is impaired.

Senators were handed graphs showing a big uptick in cases of drivers testing positive for marijuana. Some marijuana activists argue that blood tests are invasive and inaccurate gauges of impairment.

The White House has called for all states to adopt drugged driving standards.

(© Copyright 2012 The Associated Press. All Rights Reserved. This material may not be published, broadcast, rewritten or redistributed.)