Yes, and at some point I'll ask for help from my colleague, Madam Munroe.
It is a difficult area. We've been discussing these programs with the United States CBP, our equivalent organization in the U.S., in the Department of Homeland Security. The drive for the marine NEXUS program, the main thing here, has really been coming from the U.S., which believes it's a proper way to risk manage these situations. We have to think of the border as being 8,500 kilometres long, if you add the Alaskan one too. And you can talk about the lakes, the rivers, and everything. We have to have a risk management approach to these. The U.S. believes, and we've had very many discussions on this, that by risk managing it this way we reduce breaches overall—but we don't reduce breaches to zero.
The only way to have a secure approach to these large areas, where we basically cannot be, would be to have armies of people, border patrols or police, all over the country. Without them, we have to risk manage the situation.
As to your other question on NEXUS vis-Ã -vis non-NEXUS, well, there are different places where NEXUS can go where others cannot, but I'll let my colleague comment on that.