Here is a quote from a New York Times article (sorry, not a gift link because I am not a subscriber anymore) that shows the prosecution is NOT allowing itself to be limited by industry (or in this case, union) safety practices:
Mr. Baldwin’s lawyers have said that the actor properly followed safety bulletins issued by SAG-AFTRA, the union representing actors. The union has taken issue with assertions by New Mexico prosecutors that actors are responsible for checking guns that they are handed on set, saying that “an actor’s job is not to be a firearms or weapons expert.”
The prosecutors in New Mexico have countered that the union rules are not a valid defense.
“Mr. Baldwin’s failure to exercise his option to simply observe the armorer load the dummy rounds into the gun and visually and/or audibly demonstrate to the actor that the rounds are safe, inert dummy rounds was not a violation of the SAG safety bulletins,” the prosecutors wrote in Friday’s filing, “but it was a violation of New Mexico law.”
Bolding mine. The link, for anyone who might have free articles left or, better yet, be a subscriber who could gift link it: