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Marijuana Positive Drivers Increased in 2014

King County, WA – Newly released data from the Washington Traffic Safety Commission (WTSC) shows that marijuana is increasing as a factor in deadly crashes. The number of drivers involved in deadly crashes who tested positive for marijuana increased 48 percent from 2013 to 2014.

“We have seen marijuana involvement in fatal crashes remain steady over the years, and then it just spiked in 2014,” said Dr. Staci Hoff, WTSC Data and Research Director.

From 2010-2014, nearly 60% of drivers involved in fatal collisions were tested for drugs. Among these tested drivers, approximately 20% (349 drivers) were positive for marijuana.

However, just testing positive for marijuana doesn’t necessarily indicate if a driver was actually affected by the drug at the time of the crash since marijuana can be detected in a person’s blood for days (possibly weeks) after a person uses the drug. This new data is able to distinguish between drivers who test positive for THC, the impairing substance in marijuana and those who have residual marijuana in their system from prior use which may have occurred days ago.

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