After Washington State Legalized Marijuana, Number Of Fatal Car Crashes Involving Marijuana Doubled

From the National Library of Medicine, the National Institutes of Health, MedlinePlus, "Pot-Linked Fatal Car Crashes Doubled in One State After Legalization :Experts say Washington state's experience could be a lesson for rest of country" by Mary Elizabeth Dallas:

The number of fatal car crashes involving marijuana more than doubled after Washington state legalized the sale of the drug, a new study finds.

Marijuana became legal in Washington in December 2012, researchers said. Between 2013 and 2014, the percentage of drivers in Washington involved in fatal car accidents after using marijuana rose from 8 percent to 17 percent, according to the study from the AAA Foundation for Traffic Safety.

In 2014 alone, one in six drivers involved in a deadly crash had recently used the drug, researchers found.