I tend to worry more about microphones, for which there is seldom an indicator light, and which cannot be shut down by a piece of tape, than cameras. Cameras ar

I tend to worry more about microphones, for which there is seldom an indicator light, and which cannot be shut down by a piece of tape, than cameras. Cameras are visible and you need to be in front of them. Microphones are sneakier and one microphone can record a lot of people at once. Many security cameras (e.g. in public transport) now have the capability to record sound as well as video.