What is one of the first actions a CSI should take to secure a crime scene?

Establishing a perimeter and restricting access is one of the first actions a crime scene investigator should take to secure a crime scene because it helps to preserve the integrity of the scene and prevents evidence from being contaminated or destroyed. By setting up a secure perimeter, the investigator can control the flow of people and restrict access only to authorized personnel. This is crucial because the crime scene may contain vital evidence, and any unauthorized individuals entering the area could inadvertently alter or destroy that evidence.

In this initial phase of the investigation, securing the scene is paramount. It allows for a thorough examination and proper documentation of the area, which is essential for the subsequent stages of evidence collection and analysis. Ensuring that no one touches or disturbs anything helps maintain the chain of custody for evidence, which is vital during the legal process.

While the other actions are important components of a complete investigation, they are typically addressed after securing the scene. Conducting interviews with witnesses, collecting physical evidence, and creating timelines can all take place once the perimeter is established, ensuring that the scene remains uncontaminated.