back in WW2 the allies used tin foil strips to jam nazi radar -- i it was called "chaff" --
chaff worked by reflecting too many surfaces and overwhelming the radar set.
the same thing can be done with cell phone intel -- too many 'key word" hits can overwhelm the system. LOL--
the irony is the government spends billions on this shit -- and al-quaida probably has some kind of broadcaster made from a pawn-shop computer & cell phone to generate trillions of key word hits- they likely got less than $300 in it--LOL!