Fatal crashes involving drivers who recently used marijuana more than doubled in 2014. Pot was involved in 17% of fatal crashes in Washington in 2014, up from 8% in 2013 -- the year before recreational marijuana was allowed there.
"The significant increase in fatal crashes involving marijuana is alarming," said Peter Kissinger, CEO of the foundation, which funds scientifically rigorous studies for the drivers organization. "Washington serves as an eye-opening case study for what other states may experience with road safety after legalizing the drug."
But coming up with a test to get impaired drivers off the road will be far more difficult than the blood alcohol tests used to test for drunk drivers, according to the group. While tests show the ability to drive gets worse as blood alcohol rises, laboratory studies show the same is not necessarily true with increased levels of THC, the main chemical component in marijuana, in the blood. One driver with high levels of THC might not be impaired, while another driver with very low levels can be impaired.
"There is understandably a strong desire by both lawmakers and the public to create legal limits for marijuana impairment, in the same manner as we do with alcohol," said Marshall Doney, AAA's CEO. "In the case of marijuana, this approach is flawed and not supported by scientific research. It's simply not possible today to determine whether a driver is impaired based solely on the amount of the drug in their body."
The study was criticized by the National Cannabis Industry Association, which pointed to a different study, by the Transportation Department, which found that drivers who drivers who are drunk have a much greater increase in the risk of being in an accident than drivers who used marijuana.
"All this report really shows is that more people in Washington State are likely consuming cannabis, and thus might have some THC in their systems at the time of an accident. But since having THC in your system tells us nothing about your potential impairment, it would be like a report showing how many people involved in accidents had drunk a beer in the last week," said Taylor West, deputy director of the group.
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