When a subject knows he is being observed, he will normally make it
obvious by trying to lose or harass the surveillant.
Types of Surveillance
They are mobile and fixed.
Mobile surveillance is commonly called tailing or shadowing. It can be conducted
by foot or vehicle or a combination of the two.
This depends on the subject's
Fixed surveillance is used when the subject is stationary and all desired
information can be gathered in the same location. Even during fixed surveillance,
the surveillant may be mobile, moving from one vantage point to another.
Mobile Surveillance Techniques
One-man Foot Surveillance.
This technique lends a degree of risk to the
surveillant. The subject or his associates may try to eliminate the surveillant.
It is always wise to have a second surveillant ready to protect and to aid the main
Certain techniques can be applied when on foot.
Be cautious when on the same side of the street as the subject.
Stay to the rear and vary your distance from the subject.
Decide which position will give the best view.
When the subject turns a corner, be abreast of him to see if he makes a
contact or enters a building.
Two-man Foot Surveillance.
For this surveillance, use the "AB" technique.
person right behind the subject has the A position. The other surveillant has the
B position. When using the AB technique, A follows the subject and B follows A. B
may be on the same side of the street as A. Or, he may be on the opposite side of
When both A and B are on the same side of the street and the subject turns a corner
to the right, A continues across the street. He then signals B of what action to
take. The subject's actions may require B to take the A position and A to take the
Signals between A and B should attract as little attention as
When B is across the street and the subject turns the corner to the right (away
from B), B crosses and takes the A position. This step should be prearranged so no
signals will be needed. If the subject turns the corner to the left and crosses
toward B, B drops back to avoid contact. B then waits for the signal from A before
making the next move. See Figure 2-11.