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[–] candtalan ago 

Usually could consider the microphone (external Mic) socket. when a plug (blank one??) inserted, it is likely the internal mic is off or can be turned off. Machine turned off is useful, but worst case, can still monitor. Storage in a remote room may be useful etc. Extreme surveillance will get voices even though inside buildings. As said above somewhere, there is not a real privacy now days, in any meaningful way.