You're right. It's very easy, and I'd agree with everything Don mentioned. Once you start to get into more complex products, it becomes very difficult. You gave yogourt as an example. I was thinking of a meat lasagna, where you've got meat, maybe you've got two or more kinds of cheese, you've got pasta, and you've got some vegetables and some spices. Where do all these things come from? It's hard to imagine being able to put a “Grown in Canada” label on that, or even a “Product of Canada”, because of all the tracking and record keeping and proving that would have to go into saying that everything in there is Canadian. Maybe there is room for “Processed in Canada”. If they assembled all these ingredients together, should it get something?
But ultimately this complex environment comes back to why we prefer a voluntary approach. If you've got that lasagna, why force them to put a label on it? If you force that, maybe you're forcing information that's not truthful, or maybe you force the production of that lasagna to some other country.