As Ms. Des Rosiers said, when we're talking about trying to detect people who may pose a danger for whatever reason, prior to their coming into Canada, there are only two ways to do that.
One is to impose a visitor visa requirement. We would have an opportunity at that point to screen the individual, which would give us an opportunity to check with intelligence agencies, and if we were concerned about their health, we could require them to do a medical.
The difficulty with imposing visitor visa requirements is that it costs a lot of money and impedes our tourism and our ability in terms of people coming into Canada, because we have to be selective. However, if we were to require everyone in the world to get a tourist visa, then we would obviously be able to pre-screen every person coming to Canada.
There's a balance between the cost of doing that and the benefits. Clearly, that would be the most efficient way of protecting our society, but we don't do it because it costs too much money. We don't have the resources. We can't afford to close our doors in that kind of way.
The second way is by improving our intelligence sharing. This issue has been discussed repeatedly. Hopefully, the intelligence agencies have made steps. There are still a lot of steps that need to be made, but we have to ensure that we share intelligence, that we get reliable intelligence from agencies that are reliable.
Those are the two ways in which I think we could improve our methods of ensuring that undesirable people don't get into Canada.