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OftenBen · 2560 days ago · link · · parent · post: Scientists Still Seek A Reliable DUI Test For Marijuana
There isn't one. From what I understand about the way ingested cannabinoids are metabolized, there is no way to test for impairment, chemically speaking. The only thing that lab testing can tell you is if metabolites are present. The problem is that metabolite can be detected sometimes after MONTHS of complete sobriety.