The whole article was based on the false idea that cannabis "involved" accidents equal cannabis "caused" accidents.  This is clearly not the case.  Cannabis involved just means some person in the accident, not necessarily a driver had cannabis in their system,  or there was a small amount of cannabis found in one of the cars.  That's natural given the large portion of the population that now consumes cannabis. ---  Cannabis is not alcohol.  The preponderance of the research shows cannabis consumption is not a significant cause of auto accidents.   —  In 2015, the U.S. National Highway Traffic Safety Administration (NHTSA), found that while drunken driving dramatically increased the risk of getting into an accident, there was no evidence that using cannabis heightened that risk.