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. And they usually cite anecdotal evidence in support. Are they right? Are more people these days driving while impaired by drugs?