Studying car accidents in Virginia Beach, Va., during a 20-month period ending in 2012, researchers randomly sampled 3,000 accident-involved drivers and found no evidence suggesting those with marijuana in their system were more prone to accidents, according to a National Highway Traffic Safety Administration report released Friday.
When researchers controlled for factors such as age and gender, they found no evidence marijuana use increases accident risks. This was despite the fact that, in the study, drivers who tested positive for marijuana use happened to be involved in more accidents.
By comparison, the study found drivers with breath alcohol of .08 to be about four times more likely than sober drivers to be involved in accidents. Those nearly double the legal limit, at .15, were 12 times more likely to crash.
The study is billed as the largest ever conducted to assess the relative crash risk of drivers who consume alcohol compared to pot.