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The science that does exist shows significant potential for impairment among drivers over 5ng/mL. "At concentrations between 5 and 10 ng/mL approximately 75-90% of the observations were indicative of significant impairment in every performance test," reported Ramaekers et al in 2006.
Likewise, Grotenhermen et al found in 2005: "The crash risk apparently begins to exceed that of sober drivers as THC concentrations in whole blood reach 5–10 ng/mL."
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