Your perimeter on an explosion incident should be set up ______.

In establishing a perimeter at an explosion incident, it is critical to account for the potential expanse of hazardous materials or effects from the explosion. Setting the perimeter at a distance that is 1.5 times the distance of the farthest piece of evidence helps ensure the safety of investigators and responders. This approach takes into consideration not only the immediate area of the explosion but also the potential for secondary hazards that could arise from debris or other materials influenced by the blast.

The rationale behind choosing this specific distance is to provide a buffer against unexpected hazards that may not be immediately visible. Explosions can scatter debris over considerable distances, and maintaining a perimeter that exceeds the area where physical evidence is found can protect personnel from unforeseen dangers.

Wind direction and speed are indeed vital to consider during an incident response, especially in evaluating the spread of hazardous materials or smoke, but they do not directly dictate the perimeter's distance from the explosion site. Establishing a perimeter equal to the safety zone also does not account for the specific evidence-related hazards, which can vary greatly in an explosion scenario.