How to tell if a player has a c4, or any weapon on their body if it's not in their hotbar

How can I tell if a player has a c4 on their hip, or a rocket launcher on their back for example?

I've been trying to figure this out for hours already and haven't found anything, it's not in containerWear, so I'm really just confused at this point.

containerWear containerMain containerBelt,,   or   int total = player.inventory.GetAmount(itemid here);