How Much Does Marijuana Impact Your Driving?

6/23/15–A rigorous federal research study by the National Institute on Drug Abuse offers new data on the effects of marijuana on driving performance. Dr. Marilyn Huestis, the principal investigator in the study, says it is important to note that the study looked at the concentration of THC in the driver’s system while they were driving. Huestis says the researchers are looking at how to estimate how long it takes for THC concentrations in the blood to drop, and she believes that the 5 ug/L limit is not strict enough, particularly when you take into account those with low tolerance.

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