The science is actually pretty concrete regarding the impairing effects of THC. Because cannabis is a schedule 1 drug, it can be very difficult for researchers to get their hands on real world doses of THC. Instead, they use very low doses that are not relevant to what is actually sold at dispensaries. For a really good review of all things cannabis impairment, I would recommend looking through the following report by the Cannabis Control Commission in Massachusetts. A little long, but a lot of good information. https://mass-cannabis-control.com/wp-content/uploads/2019/01...
You claim that the science is concrete but cite no actual studies. I’m assuming that this kind of behavior is going to be a good indicator of the product’s actual effectiveness on driving safety overall.
I urge you to read the report. I think it relays a very balanced accounting of the facts. Its also a good place to find all the studies in one document, so I don't have to send you 100 links!
