Originally Posted by BigFlyer

I'm not looking for the usual answers like "because they are idiots."

I've gone to the Bankruptcy Court a number of times over the years (as an attorney.) The US Marshals at the metal detectors always ask to see ID, but never check it against a blacklist.

The obvious TSA rationale for asking for ID is that they check it against a list to make sure you are not a threat (yes, I know the list sucks.)

But, what is the possible rationale for checking ID, but not checking it against a list?