Assistant director Dave Halls grabbed the gun from the cart and brought it inside to Baldwin, unaware that it was loaded with live rounds, a detective wrote in the search warrant application. The gun was one of three that the film’s armorer, Hannah Gutierrez, had set on a cart outside the wooden structure where a scene was being acted, according to the records. They sought to examine Baldwin’s blood-stained costume for the film “Rust,” as well as the weapon that was fired, other prop guns and ammunition, and any footage that might exist. The Santa Fe County Sheriff’s Office obtained the warrant Friday so investigators could document the scene at the ranch outside Santa Fe where the shooting took place.