<Li> Opinion of the evaluator </Li> <P> DREs are qualified to offer expert testimony in court that pertains to impaired driving on drugs . The use of the twelve step process is scientifically validated by numerous field studies . </P> <P> Drivers who have smoked or otherwise consumed cannabis products such as marijuana or hashish can be charged and convicted of impaired driving in some jurisdictions . A 2011 study in the B.C. Medical Journal stated that there "...is clear evidence that cannabis, like alcohol, impairs the psychomotor skills required for safe driving ." The study stated that while "(c) annabis - impaired drivers tend to drive more slowly and cautiously than drunk drivers,...evidence shows they are also more likely to cause accidents than drug and alcohol - free drivers". In Canada, police forces such as the Royal Canadian Mounted Police have "...specially trained drug recognition and evaluation (DRE) officers...(who) can detect whether or not a driver is drug impaired, by putting suspects through physical examinations and co-ordination tests . In 2014, in the Canadian province of Ontario, Bill 31, the Transportation Statue Law Amendment Act, was introduced to the provincial legislature . Bill 31 contains driver's license "...suspensions for those caught driving under the influence of drugs, or a combination of drugs and alcohol . Ontario police officers "...use standard field sobriety tests and drug recognition evaluations to determine whether the officer believes the driver is under the influence of drugs ." In the province of Manitoba, an "...officer can issue a physical coordination test . In B.C., the officer can further order a drug recognition evaluation by an expert, which can be used as evidence of drug use to pursue further charges ." </P> <P> In the US state of Colorado, the state government indicates that "(a) ny amount of marijuana consumption puts you at risk of driving impaired ." Colorado law states 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 ." In Colorado, if consumption of marijuana is impairing your ability to drive, "it is illegal for you to be driving, even if that substance is prescribed (by a doctor) or legally acquired ." </P>

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