You will never hear a bug placed by a government's intelligence agency....
Yes you can hear bugs placed by a government intelligece agency. Well some of them anyway. AND
if you mention the word ( BUG ) in a room where it has been penetrated by foreign agent ; and surreptious placed audio surveillance has been installed in the room(s), the bad guys in most instances can turn the bugs off , making " Sweeping" for them next to impossible. You may not be able to hear what is being said, but they can transmit. I will not get specific on the boards.
Was there not one placed in a Seal , or Emblem in one of our embassys sometime back? Was there not a politican whom found a bug in his office placed by the FBI, about 2004, or 2005.
You can hear a bug placed by a government intelligence agency. And it does not take an electronics genious. Bug sweeping, with all of its complicated electronics of detecting, and expensive signal detection equipment...is one of the tasks that can be done with more simpler methods. From house, office, car "Bugging" by private eyes, to more complicated methods. Again......I will not get specific on the boards ; But it dont take no genious.
FF - Medic !!!!