...People will be told to wear radio tags round their necks when they get to the airport. The tag would notify a computer system of their identity and whereabouts. The system would then track their activities in the airport using a network of high definition cameras...
I'm not the only one disturbed by this, right?
Right, so ways around this:
-Swapping tags with other people in bathrooms
-->can be countered by adding restrictions: you're supposed to be flying out of this gate, then you have to exit via this gate with your own tag.
-Ditching your tag to do Bad Things™ like bombs, etc.
-Making your tag broadcast someone else's signal.
-Making your tag broadcast a scrambled or random signal.
-->Object counting software - we see people in area, but there's a person missing a tag
or /duplicate tags/unissued tag id being returned. Flag security and notify them. This is much harder, and requires a shitload of processing power, but it's doable.