What is the first step a first responder should take upon arriving at a crime scene?

The first step a first responder should take upon arriving at a crime scene is to ensure the scene is safe for all involved. This step is crucial because the safety of the first responder, victims, witnesses, and any suspects is paramount in maintaining control over the situation. If the scene is not secure, there could be ongoing threats that may endanger lives, including potential hazards such as a weapon, environmental dangers, or fleeing suspects.

By securing the area, responders can prevent further harm and preserve the integrity of the scene, which is critical for thorough investigative processes. Once safety is assured, responders can then proceed to collect evidence, interview witnesses, or call for backup as needed, but the priority is always the safety and security of all parties present.