Oh, I can explain this. Union propmasters and weapons specialists are generally paranoid suspicious bastards - in a really good way - and most of the time the industry therefore self-regulates.

This production had lost its union members. There isn't much more to say.

Ever heard of gun fairies?

These are magical creatures who put bullets into guns that you know for a fact were empty just a few seconds ago. Because of gun fairies, you should treat each gun as if simply pointing it could kill someone.

The person who taught me about gun fairies finished the lecture with this: "The interesting part is that gun fairies don't exist in real life, and yet in this profession, your life expectancy is increased if you believe in them."