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Serving the San Francisco Bay Area, Silicon Valley, Northern California and the Western United States

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Phone taps
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You should only contact us from a telephone outside of the potentially compromised location! DO NOT call from your office or home; use your cell telephone only from a discreet location.



We are often asked "How long will it take to do a sweep?" It depends on many variables. The type of structure; the proximity of the rooms; the number of rooms; the type and number of telephones and other factors. "Sweeps" of government facilities may take days because of the complexities and utilization of "exotic" devices available to government entities.

There are non-professional countermeasures technicians who, when sweeping commercial facilities, walk around the rooms with a little black box with flashing red lights and an oscillating signal and --- with a straight face --- tell you that the room is "clean".

Peter Wright, a retired Senior British Intelligence Officer, describes in his book "Spycatcher" how, in 1956, he assisted in "Operation Dew Worm" conducted by the Counterespionage Department of the Royal Canadian Mounted Police (RCMP). The Soviet Embassy in Ottawa had been destroyed by fire and was in the process of rebuilding when the RCMP decided to use wired microphones to bug the Embassy. When skillfully installed, they are almost impossible to detect.

Soon after, the Soviets re-occupied the Embassy. The RCMP heard sounds coming from the microphones. Later, they suspected the telltale sounds of a Soviet Technical Surveillance Countermeasure (TSCM) team in operation. This was confirmed when the Soviets were heard tapping at the walls for signs of hollowness and the running of metal detectors across the ceilings.

For twenty days, the Soviets "swept" the rooms containing the microphones as if they knew that the rooms had been "bugged". However, they found neither the microphones nor the installed hard wires.

Eight years later, a Soviet TSCM team returned and went directly to the rooms "bugged" and, within an hour, had located all the microphones and hard wire. They searched only the six rooms where the microphones had been planted. Mr. Wright concluded: "They must have known where to look!" Knowing where to look, what to look for, and using the proper equipment is the key. Within the commercial area, where electronic eavesdropping is most prevalent, the technician who works alone and uses one or two pieces of equipment, and is in and out in an hour is not doing his job!

On the other hand, the technician who spends his time looking for sophisticated devices costing hundreds of thousands of dollars and utilized by government against government is wasting the client’s time and money.

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We are licensed California Private Investigators: #11618