It doesn't seem like "over testing" or "harm" if the end result is less people dying. The fact of the matter is that I was able to get an MRI the same day I went to the doctor with an issue twice in the US. One of those times was for severe recurrent headaches. The doctor didn't think it was a tumor (and it wasn't), but he did it to be sure. If I were in Canada chances are I would have waited months for that appointment. In the worst case that would mean the tumor had time to grow. In the best case that's months of unnecessary worry, which isn't healthy in itself.