Note that I said to re-read my post, not the Constitution...

Executive orders? I realize they aren't part of the Constitution, but they have superseded it. I mean, some of FDR's programs and measures (including #9066) were essentially beyond the reach of the necessary and proper clause, yet they were done through executive order. And if Martial Law is declared, if I'm not mistaken, "all bets are off," so to speak.

Either way, given the previous terrorist attacks, and also the overwhelming predisposition of certain ethnicities and countries of origin connected to terror, I'd say that's probable cause, at least in the case of airport security. I'm not saying a secret police. Not even illegal search and seizure. There is no right to travel, and therefore, I would think that airport security would certainly be subject to different measures than, for example, a typical traffic stop.