[FreedomCalls]

ie there is a credible threat of a bomb on a bus and ID's are asked for and backpacks are checked, as part of dealing with the threat

You are making stuff up now. There was no credible threat. They check IDs every day at the DFC on the busses. They are not looking for someone, nor are they checking the IDs against an access list or a watch list. They simply demand an ID, glance at it, then return it.

Do you believe there is a 4th Amendment and that it means something or is it too a "nullity"?

[InsureAmerica]

""There was no credible threat""

What? When was there no credible threat?

I am using a hypothetical. Please re-read so you understand.