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FBI Ultrasonic Listening Device

In Archive, FBI, Surveillance, Technology on January 10, 2014 at 8:08 PM

via Cryptome (PDF/<1MB)/GovernmentAttic (PDF/61MB)

“Devices exist which, by sending an electrical impulse of ultrasonic frequency through a telephone circuit by tapping, will permit remote surveillance of any office in which a telephone is located y utilizing the telephone microphone as a pick-up. Such eavesdropping may be accomplished without additional wires and is possible even though the handset is in a “hung-up” position.”

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