[fireman15]

https://newsroom.aaa.com/2016/05/fatal-road-crashes-involving-marijuana-double-state-legalizes-drug/

Our State Patrol and local law enforcement have had to place a new emphasis on “impaired driving” because the problem of people driving during and after using marijuana has become so bad.

[NobleFree]

“Three years after recreational marijuana legalization, changes in motor vehicle crash fatality rates for Washington and Colorado were not statistically different from those in similar states without recreational marijuana legalization.” - https://ajph.aphapublications.org/doi/abs/10.2105/AJPH.2017.303848

https://newsroom.aaa.com/2016/05/fatal-road-crashes-involving-marijuana-double-state-legalizes-drug/

"The percentage of drivers [in Washington] involved in fatal crashes who recently used marijuana more than doubled from eight to 17 percent between 2013 and 2014."
"One in six drivers involved in fatal crashes in 2014 had recently used marijuana, which is the most recent data available."

If so, they all must have switched from driving drunk - because the total number of fatal crashes did not go up.

[NobleFree]

The actual study says, “Also, results of this study do not indicate that drivers with detectable THC in their blood at the time of the crash were necessarily impaired by THC or that they were at-fault for the crash; the data available
cannot be used to assess whether a given driver was actually impaired, and examination of fault in individual crashes was beyond the scope of this study.” - https://aaafoundation.org/wp-content/uploads/2017/12/PrevalenceOfMarijuanaInvolvement.pdf