Today's bugging devices are less detectable than ever.
The effect of modern technology on surveillance methods and techniques has been profound. With the ability to miniaturize electronics, the covert recording and transmission of video and audio information is less detectable than ever.
Voice-Activated Recorders
According to Encyclopedia.com, voice-activated recorders are able to record and store up to 12 hours of conversation. To avoid detection during transmission, the recorded information is then rapidly relayed in a "burst transmission."
Laser Microphones
If the target conversation is occurring near a resonating object--a pane of glass, for example--a laser microphone can be used to read laser beam fluctuations on the resonator caused by the voices' sound waves.
Shotgun Microphones
Shotgun microphones use a parabolic reflector (dish antenna) to pick up conversations at a distance. Filters are used to block out extraneous and ambient noise.
Advances in Transmission Range
According to Encyclopedia.com, the transmission range of bugging devices has gone from "yards to miles." Some bugging devices are able to transmit thousands of miles by beaming information to satellites.
Interception Bugs
Modern bugging devices are able to intercept cell phone transmissions and wireless computers. Others can pick up radio waves passing through a building's wiring system.
Miniaturization
Modern listening and video devices are so small they can be hidden in pens, calculators and buttons.
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