Along with Washington, a second state has qualified pot legalization for the November ballot:
The Colorado measure, if approved by voters, would legalize possession of up to an ounce of marijuana or up to six plants for cultivation, said Mason Tvert, co-founder of the Campaign to Regulate Marijuana Like Alcohol. It would also set up a regulatory framework for the sale of cannabis products and the application of sales and excise taxes, in addition to legalizing the cultivation of industrial hemp.
And how will Colorado handle stoned drivers? In Washington recently, medical marijuana activists have been opposing I-502 by misrepresenting scientific studies to claim that its DUI provision will nab sober drivers and innocent pot patients. There's no provision like that in the Colorado initiative. So what will Colorado do? A state senate committee there has now advanced 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," the Denver Channel reports. (Read the full bill here.)
That's the same limit in the Washington initiative.
In short, when initiative fails to address DUI for pot, the legislature won't let it slide (for obvious reasons) and will attempt to replicate the exact same automatic cutoff as Washington's initiative. Let's be realistic: If pot activists don't include DUI regulations, legislatures will likely do it for us—either before an initiative passes or afterward. As I pointed out last week, that THC cut off is one backed up by the evidence for giving drivers an increased risk of crashing. Back to the Denver Channel story:
"Five nanograms is more than fair," Cindy Burbach, forensic toxicologist for the Colorado Department of Public Health and Environment told senators.
Not only are I-502's critics misreading the science, they're misreading the politics.
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@45: You said "please provide us with the science behind this concept of whole blood being twice as high as serum and where I-502 clearly differentiates between the two." Sure thing. Grotenhermen, et al, which is a study cited by Patients Against I-502, explains that blood concentrations are half the serum concentrations:
Blood serum is the clear liquid that separates out when blood is allowed to clot completely. Serum is blood plasma after removal of fibrinogen by clotting. THC concentrations measured in serum and plasma of a given sample are virtually identical and are typically 1.6-2.2 times higher than those measured in whole blood (Giroud et al. 2001). For example, 5 ng/mL of THC in whole blood corresponds to 8-11 ng/mL in serum or plasma. For simplicity, this report will use a factor of 2 to convert whole blood THC concentrations into serum concentrations... To obtain THC concentrations in serum, multiply by 2.
"THC concentration" means nanograms of delta-9 tetrahydrocannabinol per milliliter of a person's whole blood.
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It is not "perfectly adequate", nor will it be once marijuana becomes available for sale to the masses.
I definitely concede that this is an imperfect solution, as is the BAC level, but hand-wringing and claiming some sort of impossibility (rather than attempting to get as close to accuracy as possible) is an absolute enemy of legalization.
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