References were made in a letter to the Swiss Police using a device to monitor a suspect or informat's sights and sounds, and transmit such to a remote location. This alledgedly occurred in the 1970's. I have read articles indicating that such alien implants can be rendered inoperable by exposing the subject to strong magnetic fields, or placing them in close proximity to an operating Tesla Coil. One such object recovered from an alledged alien abductee was shown on television. A scientific analysis of the device, which resembled a wedge-shaped glass fragment, indicated that it contained silica and trace metals.
Radio frequencies resonate in it at wavelengths that correspond to the line spacings.
It is my theory that such technology could be used to engineer a SAW device to locate a person if it was implanted just under his skin.