If several of the following warning signs apply to you then it would be
a very good idea to immediately contact Eagle Investigative Services, Inc. and
schedule an inspection as you may be the target of covert eavesdropping
When contacting Eagle Investigative Services, Inc. please remember not to call
from any suspect area or to use any suspect telephone.
- Others know your confidential business or professional trade
This is the most common indicator of covert eavesdropping activities.
Theft of confidential information is a multi-billion dollar underground
industry in the United States. Often the loss of your secrets will show
up in very subtle ways. Always trust your instincts in this matter.
- Secret meetings and bids seem to be less than secret.
Confidential meetings and bids are very popular targets for corporate
spies. How would you like the plans for the corporate takeovers your
planning to become public knowledge? Would copies of your product
designs be of any use to your competitors?
- People seem to know your activities when they shouldn't.
- You have noticed strange sounds or volume changes on your phone
Commonly caused by an amateur eavesdropper when they attach the actual
wiretap, or 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
- You have noticed static, popping, or scratching on your phone
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.
- You can hear sounds coming from your phones handset when it's
Typically 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/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 you should
schedule Eagle Investigative Services, Inc. to evaluate the situation just to
- 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 SpyShop 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 Eagle Investigative Services, Inc. and schedule a consultation.
- You 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
- 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
One of the most popular locations to hide eavesdropping devices is
inside, or behind electrical outlets, switches, and lighting fixtures.
This requires that the wall plates be removed. Look for small amounts of
debris located on the floor directly below the electrical outlet. Also,
watch for slight variations in the color or appearance of the power
outlets and/or light switches as these are often swapped out by an
eavesdropper. Also note if any of the screws which hold the wallplate
against the wall have been moved from their previous position.
- A dime-sized discoloration has suddenly appeared on the wall or
Tell tale sign that a pinhole microphone or small video camera has been
- One of your vendors just gave you any type of electronic device
such as a desk radio, alarm clock, lamp small TV, boom box, CD player,
and so on.
Many of these "gifts" are actually trojan horses which contain
eavesdropping devices. Be very suspicious of any kind of pen, marker,
briefcase, calculator, "post-it" dispenser, power adapter, pager, cell
phone, cordless phone, clock, radio, lamp, and so on that is given as a
gift. That little gift the salesman left for you may be a serious
- A small bump or deformation has appeared on the vinyl baseboard
Strong indicator that someone may have concealed covert wiring or a
microphone imbedded into the adhesive which holds the molding to the
- The Smoke Detector, Clock, Lamp, or Exit Sign in your office or
home looks slightly crooked, has a small hole in the surface, or has a
quasi reflective surface".
These items are very popular concealment for covert eavesdropping
devices. Often when these devices are installed at a target location
they are rarely installed straight. Also watch out for things like this
that "just appear", or when there is a slight change in their
- Certain types of items have "just appeared" in your office of
home, but nobody seems to know how they got there.
Typical items to watch for and beware of are: Clocks, Exit Signs,
Sprinkler Heads, Radios, and Lamps.
- White dry-wall dust or debris is noticed on the floor next to the
A sign that a pinhole microphone or video camera may have been installed
nearby. It will appear as if someone has dropped a small amount of
powdered sugar either on the floor, or on the wall.
- Small pieces of ceiling tiles, or "grit" is noticed on the floor,
or on the surface area of your desk.
Prime indicator that a ceiling tile has been moved around, and that
someone may have installed a hidden video camera or other eavesdropping
device in your office or near your desk. Also watch for cracks in the
ceiling tiles and amateur spies always tend to crack or damage
acoustical tiles. Note: all of the ceiling tiles in any executive areas
should never contain any cracks, nicks, gouges, or stains. Any ceiling
tile that becomes damaged (for what ever reason) should immediately
replaced and the cause to the damage documented. In such cases it is
also wise to have a TSCM specialist inspect the area around the chipped,
broken, or damaged tile to determine if a hostile eavesdropping device
may have been introduced.
- You notice that "Phone Company" trucks and utilities workers are
spending a lot of time near your home or office doing repair work.
If you see the same or similar vehicle more then three times then you
have a serious problem (at least according to the U.S. State Department
training course on counter surveillance)
- Telephone, cable, plumbing, or air conditioning repair people
show up to do work when no one called them.
A very common ruse which eavesdroppers use to get into a facility is to
fake a utility outage, and then show up to fix the problem. While they
are fixing "the problem" they are also installing eavesdropping devices.
Some of the more popular outage involve power, air conditioning,
telephone, and even the occasional false fire alarm.
- Service or delivery trucks are often parked nearby with nobody in
These vehicles are commonly used as listening posts, be very cautious of
any vehicle which has a ladder or pipe rack on the roof. Also, be wary
of any vehicle which has tinted windows, or an area which you cannot see
though (like a service van). The listening post vehicle could be any
vehicle from a small Geo Tracker, Suburban, Blazer, Trooper, or Cargo
Van. Look for any vehicle which could conceal a person in the back or
has tinted windows.
- Your door locks suddenly don't "feel right", they suddenly start
to get "sticky", or they completely fail.
Prime evidence that the lock has been picked, manipulated, or bypassed.
Always use Biaxial locks with sidebars (such as ASSA or Medeco). Also,
only use double sided deadbolts in all doors. Use good quality window
bars on all windows, and a good quality door bar on all doors not used
as a primary entry doors.
- Furniture has been moved slightly, and no one knows why.
A very popular location for the installation of eavesdropping device is
either behind, or inside furniture (couch, chair, lamp, etc.) People who
live or work in a targeted area tend to notice when furnishings have
been moved even a fraction of an inch. Pay close attention to the
imprint which furniture makes on rugs, and the position of lamps shades.
Also watch the distance between furniture and the wall as eavesdroppers
are usually in a hurry and rarely put the furniture back in the right
- Things "seem" to have been rummaged through, but nothing is
missing (at least that you noticed).
A "less than professional spy" will often rummage through a targets home
for hours, but very rarely will they do it in a neat and orderly
fashion. The most common "rummaging" targets are the backs of desk
drawers, the bottom of file cabinets, closets, and dresser drawers.
If you think you are being bugged, watched, or monitored, click onWhat to do if you suspect a bug? Since all
cases are unique, the design and procedure of the investigation can be
discussed without obligation or charge. All consultations are free and
considered with strict confidentiality.
For more information about how our service can be helpful in determining
if your privacy has been invaded, click on the Request For Information and provide us with as much information as you
can about your situation.