It's not for the USA, it's for France but it at least gives some actual numbers based on real measurments.
Of course people stoned driving cars cause fatalities, that's a no brainer.
Quote:
A 2005 study by French researchers Bernard Laumon and colleagues suggests driving while under the influence of marijuana, or cannabis, contributes to fatal car crashes. Researchers compiled data given by French police after administering blood and urine tests confirming the presence of marijuana in the systems of 10,748 drivers involved in fatal car accidents. The study found that driver usage of cannabis resulted in 2.5 percent of the fatalities.
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