What is typically the first action taken by investigators upon arriving at a crime scene?

The first action taken by investigators upon arriving at a crime scene is to secure the crime scene. This step is crucial because it helps to prevent contamination of evidence and ensures that the scene is preserved for thorough examination. By establishing boundaries and protecting the area, investigators can manage the flow of personnel and maintain the integrity of the scene for further analysis.

Securing the crime scene allows investigators to control who enters and exits the area, which is vital for preserving physical evidence, potential witnesses, and other critical elements that may be present. This foundational step sets the stage for all subsequent actions in the investigation, such as taking photographs, collecting evidence, and conducting interviews, all of which rely on the scene being properly secured.