There is growing concern about driving under the influence of cannabis (DUIC), especially as more states consider changing laws regarding cannabis possession and use. A key question regarding the legalization of cannabis for recreational or medical purposes is its potential impact on public health issues. Specifically, there is considerable uncertainty and debate about the impact of cannabis and its legalization on traffic safety. Among the general population, one study indicated that 36 percent of the population perceive no risk associated with DUIC. Ten percent even perceive that DUIC red...