How much risk is presented to the public by having a person behind the wheel who tests positive for THC (the active drug in weed) in his blood?
The most comprehensive study to date has now been released.
Read this link Washington Post
And the conclusion by the National Highway Traffic Safety Administration as detailed in the study:
Quote:
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drivers who tested positive for marijuana were no more likely to crash than who had not used any drugs or alcohol prior to driving.
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The key point worth emphasizing is that the blood test is meaningless as it does not indicate to what degree if any the driver was impaired. It is absolutely certain that someone actively stoned is not a safe driver but some other mechanism of determining impairment needs to be used.