Yes. The U.S. has been working on this for some time. There are technical problems, and there are funding problems, so they haven't got their entry and exit systems fully in operation yet. As far as I know, they are very valuable tools. They are catching people who shouldn't be trying to come in. I don't think they have their exit system fully operational, so they are not yet finding out who has left.
Many countries, like the U.K., Australia, and Japan, are now putting a lot of resources into this, so I think this is going to be all to the good. I think if the systems are up and running, they are catching people who shouldn't be coming in.