Page 17 - CITS Theft Guide

CITS Guide for Theft Prevention
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5. Defence in Depth: Layered Protection
CITS recommends a defence-in-depth approach: no single measure should be relied upon in isolation, so
that defeating one layer does not open the whole site. Each layer should contribute to one or more of four
functions — deter, detect, delay, and enable a pre-planned response — illustrated in the diagram below.
Figure 3: Layered site protection, from legislation, through the perimeter to the critical asset.
5.1. The Deter, Detect, Delay, Respond Model
Deterrence relies on visible security — signage, cameras, lighting, uniformed presence, and clear evidence
of marking and monitoring — making the site a less attractive target relative to others nearby. Detection
relies on video surveillance (cameras), perimeter intrusion detection systems (PIDS), alarms, guarding, and
increasingly drone-based patrol, to identify an incursion as early as possible. Delay relies on the physical
robustness of fencing, locks, cages, and immobilisation, to slow an offender for long enough that a
response can be triggered and can arrive. Response relies on a pre-planned, rehearsed, and resourced
procedure, including engagement with police and other emergency responders, discussed further in
Section 10.