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So what about Cannabis and driving?
It would seem that the current tests used by police may detect cannabis ~24 - 48hrs after consumption
NO LEVEL is legal.
~1 in 6 random tested are failing
Will they set a threshold? Do they do this where it is "legalised"
I have no doubt that cannabis impairs driving substantially, while its effects are upon the user,
however it wears off in a few hours, and 24-48 hrs makes a mockery of the law (although it is illegal to use cannabis at all)
I already posted that there is a limit on driving while using cannabis in some US States.
I just Googled and found this.
In Colorado, a person is guilty of a DUI if he or she operates a motor vehicle while under the influence of alcohol and/or one or more drugs, OR he or she operates a motor vehicle as an habitual user of any controlled substance. Colo. Rev. Stat. Ann. § 42-4-1301(1)(a)-(c) (West 2010).
The law states that in instances where THC is identified in a driver's blood in quantities of 5ng/ml or higher, "such fact gives rise to permissible inference that the defendant was under the influence."
Q: Is there a legal limit for marijuana impairment while operating a vehicle?
A: Colorado law specifies that drivers with five nanograms of active tetrahydrocannabinol (THC) in their whole blood can be prosecuted for driving under the influence (DUI). However, no matter the level of THC, law enforcement officers base arrests on observed impairment.