The legal limit for Delta 9- Tetrahydrocannabinol (THC), the main psychoactive ingredient in marijuana, was set at 5 nanograms per milliliter of blood to identify drivers who are impaired.
A marijuana-related DUI charge results from five nanograms or more, and a DWAI charge from less than five nanograms.
The Washington State Initiative-502 set a per se limit of 5 ng/mL of delta-9- tetrahydrocannabinol (THC) in whole blood for driving under the influence (DUI) to address cannabis-impaired driving.
Five nanograms or more of active Delta 9 THC per milliliter of whole blood in a driver's bloodstream constitutes a "permissible inference" in Colorado that the person is under the influence of cannabis.
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