There have been many studies analyzing the effects of marijuana use on driving, but many of them have produced contradictory results and are in fact based on flawed measurements. In the lastest study by the National Highway Traffic Safety Administration (NHTSA), researchers have concluded that while drivers who tested positive for THC were more likely to be involved in a motor vehicle crash, many other factors can contribute to this risk.
To read more about the study and the implications of how the state of Washington defines "under the influence," read this article published in the newletter You Should Know.
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