I don't think it actually is a concern, because as Dr. Clarke pointed out, it's a matter of risk management. From a practical point of view, if we have sick Americans or anyone coming to the Canadian–American border, those people are much more likely to be identified as having a certain illness. In terms of medical follow-up, it's much more practical to have them disembark before they get to the border and have them get the appropriate medical attention in a medical facility. That's not—
On April 18th, 2007. See this statement in context.