I'm betting this has been discussed before, I don't recall seeing it:

Have not cases of searches been thrown out of court as illegal, i.e., your car is stopped because of a broken tail light, the police officer searches the vehicle and finds drugs (you're not intoxicated) - a drug possesion charge is thrown out.

What's the difference between that and the TSA who are not law enforcement finding a wad of money on an alleged robber - they're not charged with looking for money or drugs. Does anyone know of any challenges to TSA searches through the courts?