What should CSAs do first upon arriving at a crime scene?

Establishing a perimeter and evaluating the scene is a critical initial step for Crime Scene Analysts upon arriving at a crime scene. This process is essential for several reasons. First, it helps to ensure the safety of all personnel involved, including responders, investigators, and bystanders. By establishing a secure perimeter, analysts can control access to the scene, preventing contamination or destruction of evidence.

Secondly, evaluating the scene allows analysts to assess the situation and determine the necessary steps for processing the crime scene effectively. This includes identifying potential evidence, considering the best approach for collecting it, and formulating a plan for further investigation. Establishing a perimeter and conducting this initial evaluation sets the foundation for a thorough and organized investigation.

In contrast, immediately collecting evidence or interviewing witnesses without first securing and evaluating the scene could lead to compromised evidence or misinterpretations of the situation. A comprehensive investigation can only follow after ensuring that the scene is properly contained and assessed. Thus, the initial focus on establishing a secure and safe environment for evidence collection is vital for the integrity of the investigative process.