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Laws Hazy on Driving Under Influence of Drugs

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Dec. 29, 2014—With the recent legalization of recreational marijuana use in Colorado, Alaska, Oregon, Washington and Washington, D.C., safety advocates are concerned that drivers under the influence of marijuana pose a threat to the safety of American motorists.  

New research from the AAA Foundation for Traffic Safety found that nearly half of Americans share this concern and report feeling that drug-impaired drivers are a bigger problem today compared to three years ago. With 85 percent of Americans supporting marijuana-impairment laws, the survey reveals that while there's awareness of this serious issue, Americans are unclear on impairment thresholds, safety implications and legal ramifications.

"While all states prohibit driving under the influence of drugs, there's significant variation in the minimum acceptable levels of marijuana or its traces in a driver's system," said Peter Kissinger, president and CEO of the AAA Foundation for Traffic Safety. "Sixteen states forbid any presence of prohibited drugs, while five others have specific limits for marijuana. With a lack of uniformity, it's no surprise we found that more than half of American drivers are unaware of the laws that exist in their state."

The Foundation's annual Traffic Safety Culture Index also revealed that, compared to alcohol, American drivers are significantly less concerned about the threat of drug impairment behind the wheel. The survey found that while two-thirds feel that those who drive after drinking alcohol pose a "very serious" threat to their personal safety, just over half feel the same way about drug use. In fact, one-in-six Americans report that, where they live, most people feel it's acceptable to drive one hour after using marijuana.

When it comes to prescription drug use and driving, Americans report feeling even less concerned, with just over a quarter reporting feeling the same "very serious" threat to their personal safety.  However, many of these drugs, along with over-the-counter medications, can impair a driver in similar ways as alcohol. Previous studies have found that a single dose of some cold and allergy medications can have the same effect on driving as being above the legal limit for blood alcohol concentration, and certain antidepressants have been shown to increase crash risk by up to 41 percent.

To educate drivers on the impact that prescription and over-the-counter drugs can have on safe-driving ability, the AAA Foundation developed RoadwiseRX, a free, interactive tool that allows users to input various medications and check for side effects and interactions that can lead to driver impairment.

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