Yes something is still bothering me.
I’ll rephrase my question as you demanded:
QUESTION FOR HEALTH TO ANSWER: What is the source of your statement that proper EMS protocol is to approach the evaluation of the victims differently when dealing with a single vehicle accident as opposed to a multi vehicle accident?
If I mischaracterized your statement, then please restate it and then tell us where we can find an authoritative reference that contains your contention.