I’ve frequently argued that there’s no scientific correlation between blood THC concentration and a person’s ability to drive without being impaired. Often, opponents will respond with a bevy of medical articles suggesting the complete opposite, while supporters will do their own research and respond in kind with contradictory literature.
It’s really a question of who is right. Who is believable. Why are studies contradictory? Since well before marijuana was widely legalized in the United States and certainly before Canada announced its intentions to legalize it, scientists the world over have been busy at work. They were trying to determine, what, if any, correlation having marijuana in the system had to traffic incidents, regardless of whether these incidents caused injury or death.