Lie-detector tests, or, rather, "truth verifier machines." My favorite line from the story: "At first, only passengers deemed suspicious by the FSB, the security service that succeeded the KGB, will take the test. But..."--come on now, you know what's coming, don't you?--"...it will eventually encompass all passengers."
How long can it be before the wise and virtuous people at Homeland Security and TSA discover how much fun they can have with this?
[Cross-posted at Proportional Belief.]