What We Know (And What We Don't) About Drug-Impaired Driving

Ask someone to identify an emerging area of interest related to motor vehicle law and chances are the person will mention drugged driving. Indeed, the U.S. Office of National Drug Control Policy in 2010 set a goal of reducing the prevalence of drug-impaired driving by 10 percent by 2015. People who work in the field frequently cite anecdotal evidence supporting the notion that driving while impaired by drugs is becoming more common. Are they right? Are more people these days driving while impaired by drugs? I thought the National Highway Traffic Safety Administration (NHTSA) might have an answer. Turns out NHTSA released a report earlier this year estimating the prevalence of alcohol and drug use by drivers and how that prevalence has changed over time. The report was based on data collected from a national roadside survey (NRS) conducted between June 2013 and March 2014. That data was compared to information collected in a 2007 NRS. Before I reveal the results, I want to say a bit about how the researchers got them. Survey methodology. Researchers collected data from more than 11,000 drivers at five locations in 60 sites across the United States (four of them in North Carolina) in one two-hour Friday daytime session and four two-hour nighttime sessions. Here is how the survey worked: Randomly-selected drivers were guided off the roadway into the research location, which usually was an empty parking lot. Research bays were demarcated by traffic cones, and each driver was directed to drive in to a [...]