Here’s your scenario:  You get a call for a truck with a high-pitch sound coming from it.  On arrival the truck is a Class B straight truck with hazardous materials placards easily identifiable on your approach.  It’s 80 degrees outside.  You also notice the labeling on the side indicates the vehicle is a medical oxygen service truck.  You also notice a white pressurized gas coming from a vent on the roof of the cargo box.  Some children playing in nearby yards.  Neighbors inform you that the trucks usual driver lives across the street.

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