Which of the following is a principle of evidence collection?

• A. Preserving the crime scene: First responders must secure the scene to prevent contamination.
• B. Chain of Custody: Do not document handling of evidence.
• C. Proper Collection Methods: Using gloves, sterile tools, and proper containers to avoid contamination.
• D. Legal Considerations: Ensuring evidence is collected lawfully to prevent exclusion in court.

Answer: (A)

Preserving the crime scene by securing it right away is the foundational principle of evidence collection. When first responders establish a perimeter and limit access, they prevent contamination and keep the scene in its original condition, which is essential for accurately interpreting what happened and for the integrity of all later steps in the investigation.

While proper collection methods, documenting every transfer (chain of custody), and ensuring lawful collection are important aspects of handling evidence, they rely on that initial protection of the scene. If the scene isn’t secured, later techniques can be compromised, and the evidence’s credibility in court can be jeopardized. The first statement captures the essential action that guards the evidence from the outset, making it the best answer.