Mr. Speaker, as the member is aware with regard to cannabis, for instance, the active ingredient is THC or tetrahydrocannabinol. I understand that it actually can be detected in one's system for up to four weeks, yet the impairment caused by using the drug may not in fact last very long at all.
This raises an interesting question. To have these kinds of charges stand up, do we have to demonstrate in the courts that not only is it detected in the system but it was present at a time when the person was impaired? It has to be concurrent. It would appear that this may be a significant problem with this drug and perhaps with others, simply because the science is not there on how to determine that persons not only had it in their system but in fact were impaired at the time that they had it in their system.
I wonder if the member could help us on that one.