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Evidence Fails To Support Proposed DUI Impairment Levels For Cannabis

Started by ronr, December 12, 2014, 12:55:49 PM

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NHTSA Report: Evidence Fails To Support Proposed DUI Impairment Levels For Cannabis
Thursday, 11 December 2014

NHTSA Report: Evidence Fails To Support Proposed DUI Impairment Levels For Cannabis
Washington, DC: Available science fails to support the imposition of driving under the influence (DUI) impairment thresholds for cannabis in a manner that is analogous to the per se limits already in place for alcohol, according to the conclusions of a November 2014 publication published by the United States Department of Transportation, National Highway Traffic Safety Administration (NHTSA). Per se traffic safety laws criminalize those who operate a vehicle with trace or specific levels of a controlled substance in their bodily fluids, even in the absence of any further evidence indicating that the subject was behaviorally impaired.

States the paper's authors, "Every state has enacted a law defining drivers who are at or above .08 grams per deciliter BAC as 'legally impaired,' but there are no similar, commonly accepted impairment levels for other drugs." Nonetheless, despite this lack of consensus, authors acknowledge that "some state laws have established levels for some drugs at which it is illegal to operate a motor vehicle" - a position which they concede is not evidence based.

"The alcohol laws are based on evidence concerning the decreased ability of drivers across the population to function safely at these BACs," they write. "Such evidence is not currently available for concentrations of other drugs."

Eleven states presently impose a zero tolerant per se DUI limit for THC and, in some cases, the presence of its inert metabolite carboxy THC. Five additional states impose per se limits for the presence of either THC or carboxy THC.

NHTSA's recent acknowledgement is far from the first time that the federal traffic safety agency has opined against the imposition of per se limits for THC. In an online factsheet, entitled Drug and Human Performance: Cannabis/Marijuana, the agency concludes: "It is difficult to establish a relationship between a person's THC blood or plasma concentration and performance impairing effects. ... It is inadvisable to try and predict effects based on blood THC concentrations alone, and currently impossible to predict specific effects based on THC-COOH [carboxy THC metabolite] concentrations."

For more information, please contact Paul Armentano, NORML Deputy Director, at: Full text of the NHTSA report, "Understanding the Limitations of Drug Test Information, Reporting, and Testing Practices in Fatal Crashes," appears online at: Additional information on cannabis and psychomotor performance is available from the NORML library here:


The report that started this topic can be read at:
Times are tough when "Happy Hour" is your nap.
My mind not only wanders, sometimes it leaves completely!



It looks like the government imposed ban on marijuana is coming back to bite them as there has been so very little scientific testing done on cannabis in the last 80 years that they have no reliable data to fall back on to make their decisions.  I believe the proper sarcastic tone for that one would be something in the order of, "smooth move genius". 

Where God leads, His hand always provides keep Calm and code on....



There's been a lot of research done on weed over the years...but it all went up in smoke! an blowing smoke :mmj:
"Today, you will be with me in paradise."

I have to be me; no one else wants the job!

Praise God and Pass the Ammo!

If only my Aunt had balls she'd be my Uncle!


 :rotfl: :rotfl: :rotfl: Well I hope they get their ducks in a row it could mean a lot of jobs here for a new "Green" economy..... :insane:


Yeah... I think with a "green" society like that, we'd likely have less problems with lawlessness and more problems keeping enough chips on the shelves.  :great: :lmao:
Where God leads, His hand always provides keep Calm and code on....



MMMMmmmm chips......Fries and gravy.....Bacon poutine!!!!!!!! what are we talking about?

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