A study conducted by the Institute for the Study of Labor recently concluded that states with medical marijuana laws may have safer roads, according to Time.
Researchers from the Institute reportedly found that the states (and the District of Columbia) that have legalized medical marijuana saw a 9 percent decrease in fatal car wrecks from 1990 to 2009. Arizona recently passed Proposition 203 which allows Arizona medical marijuana cardholders to possess up to 2.5 ounces of marijuana at a time.

