Which of the following is NOT a part of on-scene investigation elements?

The correct response indicates that conducting traffic tests is not considered a fundamental element of on-scene investigation. On-scene investigations primarily focus on immediate actions that allow responders to assess and understand the situation and gather necessary evidence at the scene of an incident.

Scene protection and examination for evidence, interviewing drivers and witnesses, and setting up an investigative plan are critical components of establishing what occurred, who was involved, and how the incident happened. These elements help create a comprehensive picture of the incident and ensure that evidence is preserved and documented properly.

While conducting traffic tests can be valuable in certain scenarios, such as determining speed or other specific factors related to traffic incidents, it is not universally required for every on-scene investigation and does not fall into the primary tasks typically categorized under standard investigative protocols at the scene. Thus, it is seen as supplementary rather than a core investigatory task.