You anticipated my next question, because of course the charter only applies to governmental actors, and these were private sector employers. Let's move to privacy. I mean, as parliamentarians we are seeking a balance here, but it's also our role to nurture and cherish Canadians' well-established privacy rights. As you pointed out, that was an issue as well in the case, that before an employer has the ability to randomly take a bodily fluid from a person, there has to be.... In fact the burden is on the employer to establish that there is a sufficient ground for that. Frankly, the employers in this country have not been able to establish that on an ongoing basis, at least according to the Supreme Court of Canada.
I think my colleague asked you about the problems of distinguishing between present impairment and past use, which is, I understand, a particular issue with cannabis. Alcohol is a bit different, because you can get a blood alcohol reading that is a reliable measure of present impairment.
Is it not the case, Mr. Keith, that with cannabis, it measures the...? I can't remember the term..