Yes, I agree with your points, However The issue is probable cause, it isn't that simple. Would you agree, that if the burden of proof has been met that someone is on or is about to board a subway or bus with a bomb, that no searches can be conducted on that conveyance, even thought the evidence is thought to be 99% accurate? We should forget about it and just wait to be blown to pieces?
Give me the document and bag search on this one...
Problem is: there is 0% evidence that she was a potential threat in any conceiveable way. That someone waved the "she could be a terrorist!" boogeyman is NOT justification of broad revocation of rights.
If there's that much concern, public busses shouldn't be entering the facility. Checking that everyone has something vaguely resembling ID sure isn't going to provide safety.
I don't agree that the burden of proof is met by a terrorist threat, because the people being searched are not the ones making the threat and therefore have done nothing to bring suspicion upon themselves. The terrorist cannot be allowed to determine the liberty of everyone else. If you are going to say the terrorist threat is 99% then you shut down the train, bus, or ship, and deal with it that way. Joe Citizen does not deserve to have his rights stripped because Joe Terrorist wants to make trouble.