Mr. Speaker, the objective or goal here is not necessarily to limit the amount of a substance in a person's system, but to prevent people from driving while they are impaired by any substance.
It is absolutely difficult for us to ascribe particular levels of individual impairment to particular THC or alcohol levels, although with alcohol it is much easier. However, we we cannot just throw up our hands and say that it is tough, so we are not going to do it. We have to establish a legal minimum, some legal standards on which we can operate. We may refine them later on and lower them, but for now it is certainly unacceptable for people to be driving with more than the prescribed levels of THC in their bloodstream.