CPD Academy Practice Test 2026 - Free CPD Practice Questions and Study Guide

Preserving evidence integrity at a scene means you don’t disturb items unless it’s absolutely necessary. The idea is to keep the original state as much as possible so their meaning and context aren’t altered, which is crucial for investigations and any later legal proceedings.

The best formulation allows touching only when needed for safety or to prevent loss of evidence, and only after you’ve photographed, tagged, and logged the item. Photographing first creates a record of the scene as it was, and tagging and logging establish a clear chain of custody so anyone who handles it knows its history. The exceptions—officer safety and situations where evidence could be destroyed by weather or other conditions—recognize real-world needs while still prioritizing documentation and eventual preservation.

Why the other ideas don’t fit: restricting touch to zero contact is impractical in many scenes, and would hamper safety and safe handling. Focusing only on photographing newly collected evidence misses the ongoing requirement to avoid disturbance and to maintain provenance through tagging and logging. Saying you should touch everything to avoid missing something is exactly what risks contaminating or altering evidence and breaking its integrity.