As I understand it, they can’t listen to all of the people all the time. On the other hand, they may be listening to some of the people some of the time.
By the way, don’t “they” work for us? Just checking. It’s hard to tell, these days.
The snooping strategy worked quite well for the three killed and more than 260 injured in the Boston Marathon bombings, didn’t it? The two explosions occurred despite the fact that authorities reportedly were tipped off beforehand that the Tsarnaev brothers might have been a threat.
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