No. With respect to alcohol, because that's really predominantly what I testify on, as I am the chair of the drugs and driving committee but most of our cases are alcohol, certainly, within the scientific literature, impairment has been demonstrated at as low as 15 milligrams of alcohol in 100 millilitres of blood. I notice a lot of people are speaking in grams, but for the purposes of the Criminal Code, it's in milligrams. This may equate to one drink. That impairment has been demonstrated in a lab setting.
With respect to THC, the easiest answer is that if you compare somebody who has been smoking, regardless of their concentration, and somebody who has not been smoking, I would expect impairment in the person who has been administering the drug.
With regard to the question about concentration and correlation to impairment, when we were asked this question about coming up with a per se limit, of course we looked at what other countries were doing and things of that nature. We really did focus in on smoking, because ingestion of cannabis has such low THC levels that potentially they won't be caught in these per se limits. They could be lower than five and potentially lower than two. We looked at the literature.... Granted, these are not the high-potency types of products that are used recreationally now, and there's a reason for that. People don't want to study high-potency products because of the adverse drug reactions that are potentially possible—