U.S. vs Davis: “[an administrative search is allowed if] no more intrusive or intensive than necessary, in light of current technology, to detect weapons or explosives, confined in good faith to that purpose, and passengers may avoid the search by electing not to fly.”

The TSA claims that passengers entering the airport give "consent" to actions that the TSA refuses to define.

If the "searchee" isn't aware of the ramifications and scope of the search to which they've granted "consent," then I don't believe "consent" has actually been granted.