Which of the following is NOT a responsibility of the first officer arriving at a crime scene?

The responsibility that is not assigned to the first officer arriving at a crime scene is the act of arresting a suspect. The primary role of the first officer is to assess the situation and ensure safety, which involves responding to the scene, providing emergency care to anyone in need, and securing the scene to preserve evidence and prevent contamination. While making an arrest may be necessary in some situations, it is typically handled by specialized law enforcement personnel who are trained to follow proper procedures for detaining suspects. The focus of the first officer is on immediate safety and preserving the integrity of the crime scene, rather than engaging in arrest procedures, which can be complex and require additional support. This delineation of responsibilities ensures an effective and careful response to the scene, prioritizing the safety of all individuals involved.