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The recording device was concealed on a person Thatcher had previously approached for help in the crime. [citation needed] Electronic bugging devices were found in March 2003 at offices used by French and German delegations at the European Union headquarters in Brussels. Devices were also discovered at offices used by other delegations.
Walmart security watches shoppers enter on Black Friday This "code" is one of many innocuous sounding secret codes that stores use to alert employees to problems without distracting you from shopping.
On 25 August 2009, U.S. patent 7,580,533 was issued for a device that uses a laser beam and smoke or vapor to detect sound vibrations in free air ("Particulate Flow Detection Microphone based on a laser-photocell pair with a moving stream of smoke or vapor in the laser beam's path"). Sound pressure waves cause disturbances in the smoke that in ...
The device, a passive cavity resonator, became active only when a radio signal of the correct frequency was sent to the device from an external transmitter. This is referred to in NSA parlance as "illuminating" a passive device. Sound waves (from voices inside the ambassador's office) passed through the thin wood case, striking the membrane and ...
Hidden video cameras may or may not have audio recording capabilities. Hidden cameras may be activated manually, remotely, or through motion detection. A hidden camera may not be visible to the subject, for example, because it is fitted with a long-focus lens and located beyond the view of the subject, or because it is obscured or hidden by an ...
The devices do have the technical capability to record the content of calls, so the government requires these content-intercepting functions to be disabled in normal use. [12] In September 2015, the US Justice Department issued new guidelines requiring federal agents to obtain warrants before using stingray devices, except in exigent circumstances.