For something like a deadly weapon, you would be negligent if you didn't verify yourself that it won't harm someone.
This is my belief. I'm not going to possibly shoot and kill someone just based on someone's words.

The prosecutor is going to try to make the case that it is industry standard procedure that the actors go through gun training, that they are the last line of verification, and that Baldwin was negligent in these aspects.

I don't know how the industry works and what the standard is. But in my opinion, the holder of the gun should be ultimately responsible for what happens with it.