It does say “at least four”, and I’m guessing they’re the blatantly obvious safety rules.
only 4?
^^^^^^this^^^^^^^
Prosecutor to Armorer:
What do they call these little things?...
“Blanks”
How do you know?
“the shape and color”
What do they call these little things?...
“Bullets?”
It’s okay, just shout it out everybody knows.
And what’s this little metal pointy thing?
“A projectile”
That’s right!
So tell me how a live round found it’s way into a “prop” gun you were responsible for?
“I didn’t check it before handing over to the actor”
or
“I cleared it, checked it and someone between the time I handed it over put a live round in it for whatever reason.”
“someone with a motive to have her killed or kill them themselves.”
“Only four?”
Five. He forgot to take the cannoli.