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You have noticed strange sounds or volume changes on your phone lines. This is commonly caused by an amateur eavesdropper when they attach a wiretap, or activate a similar listening device. Surveillance devices often cause slight anomalies on the telephone line such a volume shift or drop-out. Professional eavesdroppers and their equipment usually do not make such noises; so if this is going on it could indicate that an amateur eavesdropper is listening in. On the other hand you could simply be experiencing a flaw in the line, but you should check it out. You have noticed static, popping, or scratching on your phone lines. This is caused by the capacitive discharge which occurs when two conductors are connected together (such as a bug or wiretap on a phone line). This is also a sign that an amateur eavesdropper or poorly trained spy is playing with your phone lines. It could be nothing more then a problem with your phone line or instrument, but a TSCM person should evaluate the situation to make sure. Sounds are coming from your phones handset when it's hung up --- This is often caused by a hook switch bypass, which turns the telephone receiver into a eavesdropping microphone (and also a speaker). There is probably somebody listening to everything you say or do within twenty feet of the telephone (if this is happening). Your phone often rings and nobody is there, or a very faint tone, or high pitched squeal or beep is heard for a fraction of a second. This is an indicator of a slave device, or line extender being used on your phone line. This is also a key indicator of a harmonica bug, or infinity transmitter being used. Of course it may also be nothing more then a fax machine or modem calling the wrong number (but a TSCM person should evaluate the situation to make sure). You can hear a tone on your line when your phone is on the hook (by using an external amplifier). To check for something like this you would have to obtain a "recorder starter" interface (with a VOX option), or some kind of a high gain audio amplifier such as a uAmp or Kaiser 1059. Then with the phone hung-up listen to your telephone wiring. If you hear a faint solid dual tone it is a dead giveaway of someone using a "slave" eavesdropping device on your (or one of your neighbors) telephone lines. Such devices create a "command tone" when the subject hangs up the phone (so you must ensure that all of your phones are hung-up). On an added note: the most common command tones for illicit eavesdropping devices are 2100 Hz and DTMF-C, but any tone combination may be used. Your AM/FM radio has suddenly developed strange interference. Many amateur and spy shop eavesdropping devices use frequencies within or just outside the FM radio band, these signals tend to drift and will "quiet" an FM radio in the vicinity of the bug. Look for the transmissions at far ends of the FM radio band, and at any quiet area within the FM band. If the radio begins to squeal then slowly move it around the room until the sound become very high pitched. This is referred to as feedback detection or loop detection and will often locate the bug. The "stereo" function should be turned off so the radio is operating in "mono" as this will provide a serious increase in sensitivity. If you find a "squealer" in this manner then immediately contact a TSCM and get them to your location FAST. Your car radio suddenly starts "getting weird" Keep in mind that the antenna your car radio uses may be (and often is) exploited by an eavesdropper, and that such usage may interfere with radio reception (so be concerned if you automobile radio suddenly starts getting weird). Your television has suddenly developed strange interference. Television broadcast frequencies are often used to cloak a eavesdropping signal, but such a devices also tends to interfere with television reception (usually a UHF channel). Televisions also "suck in" a lot of RF energy and because of this are very sensitive to any nearby transmitters (this is technically called "Bandwidth, and TV signals use a lot of it). A small handheld television with a collapsible antenna may be used to sweep a room. Carefully watch for interference around channel numbers 2, 7, 13, 14, 50-60, and 66-68 as these frequencies are very popular with eavesdroppers. You have been the victim of a burglary, but nothing was taken. Professional eavesdroppers often break into a targets home or office, and very rarely leave direct evidence of the break-in; however, occupants of the premises will often "pickup on something not being right" such as the furniture being moved slightly. Electrical wall plates appear to have been moved slightly or "jarred". One of the most popular locations to hide eavesdropping devices is inside, or behind electrical outlets, switches, smoke alarms, and lighting fixtures. This requires that the wall plates be removed. Look for small amounts of debris located on the floor di