Prosecutors delivered an opening statement Thursday at the first trial in the fatal shooting of a cinematographer by actor Alec Baldwin on the set of the Western film “Rust,” describing a movie weapons supervisor as sloppy and negligent in handling guns and ammunition while skipping basic safety protocols.Before Baldwin’s case progresses, the weapons supervisor is being tried on charges of involuntary manslaughter and tampering with evidence in the death of cinematographer Halyna Hutchins on Oct. 21, 2021, during a rehearsal on a movie ranch outside Santa Fe.Armorer Hannah Gutierrez-Reed has pleaded not guilty to the charges and says she’s not directly to blame for Hutchins’ death.Prosecutors said they plan to present evidence that Gutierrez-Reed unwittingly brought live ammunition onto a film set where it was expressly prohibited. They say the armorer missed multiple opportunities to ensure safety, eventually loading a live round into the gun that killed Hutchins and failing …