What for? I frequently associate with PA CIII dealers. We even have a large and active club, here. I don't ask the other guys if they're armed, and they don't ask me, either. (Nobody cares!)
As for the Range Safety Officers? Yes, they follow certain additional range safety protocols; but they also know exactly what you're shooting because, for one thing, they have their left-hand on the back of your neck as you move between targets.