Actually, you can do roadside maneuvers for MJ intoxication and there are indicators for it. However, it does require an arrest and consent to a blood test in the minimum, and a DRE (Drug Recogntion Expert) evaluation and blood test at the maximum. Given there are so few DRE certified officers in Colorado, the easiest way would be to train officers to look for the indicia and upon a probable cause arrest, request a blood test.






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