It is a question of volumes. We've had about 193,000 people come to Canada by air since we established the new border measures. There are three tests. As you point out, there is the first test. It may be that they had a faulty test. It may be that the test was inaccurate. In some instances, which Transport Canada has pursued, it might be that the documents were not in fact accurate.
They have the pre-arrival test. Once they get off the plane, after they've gone through my colleagues at the Canada Border Services Agency, they come to us for a discussion of their quarantine plan and they go and get the on-arrival test. The on-arrival test is very important because, as you point out, we're catching people who are in fact COVID-positive. If they're COVID-positive, we take a genetic sample from that test and sequence it to determine what they're COVID-positive with, what variant it is. Then they go into quarantine. In the quarantine, they have their third test.
To your point, some people do arrive, and that's why we have that second and third test.