Rather than talking about security check points for searches with carry ons, could everyone add some comments about checked bags that are not in your possession, passed in unlocked (by a requested US governmental policy, not a law) and then searched without owners present. That, IMO, is the constitutional issue. If owners are present, it is then constitutional by agreeing to be searched, to watch this search and to move forward, or not agreeing and leaving the airport.

Build tents or restructure the airport but adhere to the Constitution.