Sure.
In terms of the effectiveness of labelling, you might want to talk to some of the folks from the tobacco groups on this panel, where labelling has been very effective. And it has been quite effective in California. Does a label convince someone to do what they're supposed to do 100% of the time, or even 50% of the time? Probably not. The point is to give consumers enough information to make an informed choice, and I think consumers deserve that.
In terms of the thresholds, yes, we can detect at a nano level. Any prohibition that's regulated pretty much anywhere that I've seen, including Canada, has a safe use threshold, which is essentially.... In California, it's called a safe use threshold. Here, under the Hazardous Products Act, we simply define the level below which we're not going to be concerned about. It's a diminished threshold--