You hit the nail on the head HugeAss. Many airports don't have enough police officers to properly escort all the passengers out of the airport. If passengers have connecting flights they need to be re-screened.

Screenerx, the process is usually the normal screening process. Passengers are escorted to the checkpoint, a lane is usually closed and used just for these passengers.

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Originally posted by HugeAss:
It's only my opinion, but I believe the TSA wants to do a reverse screening at the destination airport to keep prohibited items from advancing into an airport's sterile area. Having the police escort the passengers out of the terminal would most likely not endanger anyone, but the TSA wants total control of unscreened items entering the sterile area.