The only comment I have on that is, as I'm sure you know, Canada is currently negotiating with the United States a Beyond the Border strategy that was announced by Prime Minister Harper and President Obama. As part of that overall agreement, there is a pilot project right now in Prince Rupert, and then there's another one between Montreal and the United States, using the concept of inspecting once, accepting twice. For example, if a steamship line chose the Port of Prince Rupert to dock and the containers that were offloaded at Prince Rupert were ultimately destined for the United States—just transiting through Canada because they had to in order to get to the United States—then under the Beyond the Border agreement, whichever party, Canada or the United States, who physically received the goods first would be the party to do the searching and checking. Thus, when it actually got to the frontier points of the United States and crossed legally and technically onto U.S. soil, there would be no need for a customs officer to re-check it because it would have been checked at the first point of entry into North America. North America is defined as Canada and the United States.
I don't know if you are familiar with that aspect. I know it's minutia, but it's part of the Beyond the Border deal. It's currently being piloted between Canada's CBSA and the U.S. CBP.
I don't know if that directly answers your question.