What is the role of scene security and access control during an investigation?

• A. To limit the number of witnesses.
• B. To prevent tampering, protect evidence, and ensure safety and chain of custody.
• C. To document weather conditions only.
• D. To speed up the flight readiness.

Answer: (B)

Maintaining scene security and controlled access is about preserving evidence integrity and ensuring safety throughout the investigation. When entry is restricted to authorized personnel and a clear log is kept, the risk of tampering or contamination is minimized, and every item or observation can be traced back to who handled it and when. This supports a verifiable chain of custody, which is essential for the evidence to be admissible and the investigation to be accurately reconstructed. It also protects investigators and others from hazards at the scene, and helps preserve the original conditions under which evidence was found so measurements and observations remain valid. While documenting weather or managing witness numbers can be relevant in other contexts, they do not address the core purpose of access control, which is to safeguard evidence and maintain a safe, orderly environment for the investigation.