- [1]: A study in Canada analyzed crash reports and blood tests to look at the state of drivers responsible for accidents. While alcohol had a very clear and statistically-significant influence on the risk of a driver causing an accident, THC did not.

I don't understand how this study can make that claim just looking at crash report data. The assumption that not at fault drivers are representative of people who aren't in accidents at all is pretty generous? It seems likely that folks who are unimpaired are also better at avoiding accidents / driving defensively