Solving the Cannabis Conundrum

by Community Manager ‎02-10-2015 02:42 PM - edited ‎02-13-2015 10:10 AM (3,038 Views)

AAA Foundation research to help bridge knowledge gap on marijuana-impaired driving


As the legalization of marijuana becomes more widespread, the lack of knowledge and research about its effects on drivers is becoming more glaring. AAA is one of the leading organizations helping to fill that gap.


“When it comes to cannabis and driving, public policy is way ahead of the research and data, which is counterproductive,” says AAA Traffic Safety Advocacy & Research Director Jacob Nelson.


The recreational use of marijuana for adults is now legal in four states—a number that doubled late last year, when voters in Alaska and Oregon joined Colorado and Washington in approving ballot measures—and 19 additional states (including Michigan, Minnesota and Illinois) plus the District of Columbia have authorized marijuana for medicinal purposes.


Marijuana is the most popular recreational drug in the U.S. after alcohol and tobacco, according to Dr. Barry Logan, vice president of Forensic Science Initiatives and chief of Forensic Toxicology at NMS Labs and an internationally recognized expert in alcohol, other drugs and traffic safety. Logan reports that in 2013, an estimated 25 million Americans smoked cannabis, and more than 14 million do so regularly. Tetrahydrocannabinol, or THC, the active ingredient in marijuana, is the second most common substance, after alcohol, found in the blood of impaired and fatally injured drivers.


The most recent roadside survey by the National Highway Traffic Safety Administration shows that 8.65 percent of drivers had marijuana in their systems on weekend evenings. Several other studies have shown that up to 14 percent of drivers who sustained injuries or died in traffic crashes tested positive for THC.


Logan says past studies support the belief that marijuana smokers have an increased crash risk within two hours of smoking. And according to the National Institute on Drug Abuse, marijuana negatively affects drivers' attentiveness and perception of time and speed.


“There's a lot of focus on marijuana from the legal side,” says head of the National Highway Traffic Safety Administration Mark Rosekind. “What's not being discussed is the safety side of it. I think most people, whether they smoke marijuana or not, would say they don't want to be driving next to somebody who's impaired by marijuana.”


Indeed, AAA's 2013 Traffic Safety Culture Index shows that 80.3 percent of drivers support having a law on marijuana that would make it illegal to drive with a certain amount of marijuana in one's system. However, lack of data has prevented a consensus on what such a standard should be.


Even though marijuana is now legal in some form in nearly half the states, there is no standardized roadside test—such as a Breathalyzer for alcohol—that measures THC levels in a driver's system. Similarly, no nationwide legal standard—such as a .08 percent blood alcohol concentration—constitutes driver impairment in regards to marijuana.


The AAA Foundation for Traffic Safety is sponsoring two studies that began last year to determine, among other things, whether the incidence of marijuana-impaired driving in Washington State has increased since legalization, the relationship between the blood concentration of THC and crash severity, and a threshold of active THC blood concentrations at which driver impairment and crash risk increase significantly. The results of both studies are expected to be released by early 2016.


“The AAA Foundation is doing important research that is needed to move the needle in this area,” Nelson says. “And AAA is geared to leverage those results to guide public policy and education efforts across the states.”


About the Author: Kevin Adams is a freelance writer based in Orlando, Florida, and writes for multiple AAA publications.


To learn more about AAA’s research on highway safety issues, visit


Image credit: Milos Stradiot/iStock

by mcf814
on ‎02-27-2015 11:23 AM
"Marijuana is the most popular recreation drug in U.S.after alcohol and tobacco..." Come on! And the Seahawks are NFL champions, except they lost the Super Bowl. Why the leading commentary (even if quoted)? How many of the 14% in accidents cited being injured or killed testing positive for marijuana had alcohol in blood too. I'd wager that number to be 100%. Noone should be driving under the influence, but I am tired of glaringly negative articles about marijuana legalization. This plant has shown to be medically beneficial. What is the benefit of beer or whiskey? Even the benefits of red wine have been downgraded. The real question should be "if a monster like alcohol is legal, why isn't marijuana?".
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