Berkeley Brean asked, “Are the cars in the short term lots and long term lots getting searched as well?”
John McCaffery, TSA, said, “No, those vehicles that are in the garage, short term long term parking, even if they carry pretty large amounts of explosives, they would not cause damage to the front of the airport. But for those who use the valet, the car could be there for a half hour or an hour so there is a vulnerability.” (source)