One of the areas that we have been concerned about is the expansion of facial recognition and other biometric technology in airports. We haven't looked specifically at Nexus, but the same principle holds with, for example, the global entry system in the United States.
The concern, of course, is that as people become required to provide face prints or iris scans to access essential services—going to the airport, crossing the border, entering a government building—it facilitates a checkpoint society the likes of which we haven't seen before. These are not contexts in which people can meaningfully opt out, so one clear area of regulation could be providing people with a meaningful opt-out by saying that, if you don't want to prove your identity via an iris scan, we'll provide you the option to do so another way, with your passport, for example, or with your Nexus card, for example.
On the airport use and the border use, because it's such a coercive environment, because people don't have the choice to walk away, that has been a big concern.