The appeals court said that expert testimony established that terrorists seek predictable and vulnerable targets and that the subway search program "generates uncertainty that frustrates that goal, which, in turn, deters an attack."

If you see they are searching today, you can take an alternate means of transportation, or walk to the next stop. Terrorists are unlikely to do this, because it screws up their operational plan. Frankly, if they can search everyone getting on an airplane, they can search people getting on trains. They can search people going into schools, going into malls, going into stores. They can search people everywhere. They can search them all the time. As long as its possible that a bomb might go off there, the searches will be considered reasonable.

Searches of Bags in Subway Upheld