The studies we've seen have all shown that there has been a higher percentage of people with marijuana in their system involved in fatal accidents. This is a problem in that we do not have causation studies. We do not have what level they were at, only “presence of”. They are not anywhere near as good as the studies we've had with respect to alcohol.
It is certainly a major concern and one reason we hope this legislation will be in place before the legalization of cannabis. I believe that's the government's aim.