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Not all bugs are the same.
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If it's got a battery, it's disposable, short-term.
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If it's wired into the house power,
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it's a longer-term thing.
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If it has a transmitter,
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you can figure out how close the listener is.
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Mom, are there any empty houses in the neighborhood
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within, say, hmm, 350 meters?
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Across the street, two doors down.
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Once your surveillance knows you're onto them,
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the clock starts ticking.
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They know you're coming, so the question for them