These are called Nonlinear Junction Detectors (NLJD). High-end bug detectors have another technique they use that claims to be able to find active device junctions. Or perhaps it records to memory and doesn’t transmit anything. But what if the bug were more sophisticated? Maybe it wakes up every hour and beams its data home. The lamp probably shouldn’t be emitting RF energy all the time, so that’s easy to detect and a dead give away. If you had a bug that transmits all the time, that’s easy. Of course, as a hacker, you have to start thinking about how that would work. If you ever watch a spy movie, you’ve doubtlessly seen some nameless tech character sweep a room for bugs using some kind of detector and either declare it clean or find the hidden microphone in the lamp.
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