(2) When across the street from the subject, how you follow will be
dictated by circumstances. You may operate forward, to the rear, or abreast of
him. It is best if you can be abreast when he turns a corner. This enables
the observation of any contact made or an entry into a building.
c. Two-Man or "AB" Surveillance.
In the "AB" technique the surveillant
directly behind the subject is always designated as "A."
"A" follows the
subject; "B" follows "A," either on the same side of the street or just across.
When both operate on the same side as the subject, and he turns a corner, "A"
continues in the original direction. He crosses the intersecting street. From
a vantage point there, he signals the correct moves to "B."
"B" should not
turn the corner or come into sight until he has received the signal. When "B"
is operating across the street and the subject turns a corner to the right,
away from "B," "B" will cross the street behind the subject. He will take up
the "B" position.
This move should be prearranged; no signals should be
necessary. All visual signals used should be discreet and consistent with the
environment (see Figure 3-1). Should the subject turn to the left and cross
the street toward "B," "B" should drop back to avoid meeting him. "B" could go
into a store, or continue ahead. "B" should keep "A" in sight. Then "B" can
observe "A's" signals indicating what the next move should be (see Figure 3-2).
d. Three-Man or "ABC" Surveillance.
The "ABC" technique is intended to
keep two sides of the subject covered. "A" follows the subject. "B" follows
"A" and concentrates on keeping "A" in sight rather than the subject.
normal position for "B" is behind "A." "C" normally operates across the street
from the subject and slightly to his rear.
This enables "C" to observe the
subject without turning his head. Variations would be having both "B" and "C"
across the street. Another would be having surveillants behind the subject on
the same side of the street. "A," "B," and "C" may be necessary due to crowded
conditions or vehicular traffic.
In this technique, if the subject turns a
corner, "A" continues in the original direction.
He then crosses the
intersecting street, and signals instructions to other surveillants.
"B" or "C" can be given the "A" position. "A" may take up the original "C"
position and continue his observation of the subject from across the street
(see Figure 3-3). In another variation of this technique, both "A" and "B" may
continue in the original direction and cross the street. "A" signals "C" to
take up the "A" position. "B" then recrosses the street and assumes his former
"A" assumes the "C" position (see Figure 3-4).
In a third
situation, when "C" notices that the subject is about to turn a corner, he
signals both "A" and "B" what positions to assume.
the chance of a surveillant being "made."
For instance, by either
prearrangement or signal, the two or more surveillants will change places with
This technique is commonly referred to as the leapfrog method.
The progressive surveillance is another technique used when extreme caution is
mandatory. In some situations it is presupposed that the subject will use all
possible methods to elude surveillants. In this case, progressive surveillance
may be used. It is a slow method and is limited to situations where there is
plenty of time. It is also limited to subjects who follow