I'll answer on behalf of Mr. McKenna.
First of all, we think the full-body scanners fulfill an important role. Is it a 100% solution? No.
As you've noted, there is electronic explosive vapour detection and there is also electronic explosive trace detection. The trace detection right now is being utilized in Canada. It's the swabs that are taken on your luggage. So if you even have a bomb, the chemicals are usually so volatile that you would probably pass those chemicals on to other articles you carry or wear. So we're utilizing that, and we're not saying we should get rid of it.
The United States, after many years of denying the usefulness of vapour detection, is now trialling it at a number of their larger airports.