The short answer is the same. I agree with you that the contexts are very similar, but as Mr. Comeau pointed out earlier in his presentation, the way the body deals with these substances is different. This is in large part why Parliament's leadership would be needed to establish per se limits and to approve for use devices to screen for drugs in the workplace.
Right now, to my knowledge, there is no such thing as a Breathalyzer for drugs to be put—