The two entities that need to know where the overspray came from are the painting contractors that painted in the general area and the vehicle owners who
have had their vehicles covered with paint overspray.
One way to determine where the over spray came from is to look at surfaces such as signs, windows, fences and plants that are permanently positioned between the suspected source of the overspray and where the affected vehicles were parked . If the windows on a building are heavily covered on its east side, most likely the overspray came from the west. If a painter was painting on the west side of the building, he most likely is not responsible for the overspray.