What is one of the primary duties of an investigator at a crime scene?

One of the primary duties of an investigator at a crime scene is to ensure the crime scene is free of unauthorized personnel. This responsibility is critical for maintaining the integrity of the scene, preserving evidence, and ensuring that no contamination occurs. By controlling access to the scene, the investigator protects vital physical evidence that could be crucial for solving the case. This includes both avoiding the potential alteration of evidence and ensuring that witnesses can provide their accounts without interference or influence from others.

Maintaining a secure perimeter around the crime scene also allows for the proper documentation and investigation of the area by trained personnel. If unauthorized individuals were to enter, it could compromise evidence and hinder the overall investigation. Hence, controlling access is fundamental to effective investigative procedures.