Here's one for you Americans in this thread.

Here in the UK at BRS and I believe LGW at least, they digitally photograph all passengers at the security check. This is done by a video camera fixed on a mounting, when you board your flight the boarding card scanner throws your picture up on a computer screen. I assumed at first it was a secondary check to make sure the person that went through security actually was the person getting on the flight. Now however I'm leaning towards the thought that the picture is fed into a central computer system and checked against a list of known suspects.

Now would this be deemed to breach constitutional rights ? I expect to get several different answers on this

Nigel