To put it simply, it is not possible to test how many nanograms of THC is too many to drive. This is an area of some confusion among law enforcement officials as there are no real tests that can be taken and no definitive guidelines to go by. The test for alcohol bears no applicability to THC, the active compound found in Cannabis. This is because alcohol dissolves in water, while THC dissolves in fat. So while a driver may be clearly stoned, there is no way to test for…
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