2014- Colorado Impact Study- Driving Impaired Section

Overall, traffic fatalities in Colorado decreased 14.8 percent, from 2007 to 2012. During the same five years in Colorado, traffic fatalities involving operators testing positive for marijuana increased 100 percent.

In 2007, Colorado traffic fatalities involving operators testing positive for marijuana represented 7.04 percent of the total traffic fatalities.  By 2012, that number more than doubled to 16.53 percent.