Originally Posted by rjque
I think you always have to re-clear security after an international arrival, even if you arrive and depart from the same terminal. The reason is that you pass through a non-sterile area at customs where you are required to pick up checked luggage for customs clearance. You can carry firearms and other prohibited items in checked luggage so I can see why the TSA would want to re-screen after you've been in contact with that luggage.
Exactly. A prime example is Minneapolis -- you go right from the gate into Immigration and Customs, and then back into a security checkpoint that puts you into the terminal proper (even though it's all one physical building).
Steve