What actions preserve evidence integrity at an accident scene?

• A. Photograph only; move vehicles immediately; delete videos; no documentation of access.
• B. Secure perimeter; photograph/video; record measurements; maintain chain of custody; minimize scene disturbance.
• C. Record measurements only.
• D. Secure perimeter only.

Answer: (B)

Preserving evidence integrity at an accident scene starts with keeping the scene intact and under controlled access. Securing the perimeter prevents unauthorized movement or contamination of useful clues. Documenting the scene with photographs or video captures its initial condition and the relationships between items before anything is moved. Recording measurements ensures we have precise spatial data about vehicle positions, skid marks, distances, and other critical details. Maintaining a chain of custody provides a clear, auditable trail showing who handled each piece of evidence and when, which is essential for reliability in investigation and court. Minimizing scene disturbance helps preserve footprints, debris patterns, and other physical indicators that could reveal how the incident occurred.

Anything that moves or alters the scene—like moving vehicles too soon, deleting video evidence, or failing to log who accessed the area—can compromise what actually happened and undermine trust in the findings.