I'd hate to say that we ought to be regulating those ships because before we regulated the other vessels, we had to determine the risks they posed. That risk, for the Great Lakes at least, was determined largely by the evidence that we saw—that somewhere between 55% and 70% of the invaders that had come into the Great Lakes were from Eastern Europe. They had no opportunity to get here other than by ballast water, so we knew ballast water was the villain. In that case, knowing that it was a problem, I saw no alternative whatsoever. In fact, I strongly encouraged a policy to require this open-ocean flushing.
In the case of the lakers I've mentioned, we've done a little bit of work, funded by Transport Canada and using a DFO scientist, Dr. Sarah Bailey, and we've analyzed some ballast water samples coming into the Great Lakes. However, I don't think the evidence is sufficient for us to now say these ships clearly pose a risk, therefore they should be regulated. That requires more study.