 Witnesses are taking the stand in the Alec Baldwin involuntary manslaughter trial in New Mexico. Prosecutors are trying to prove that Baldwin was acting negligently while holding a prop gun on the film set of the movie Rust. A live bullet was discharged from that gun, killing cinematographer Helena Hutchins and wounding director Joel Souza. On the second day of witness testimony, jurors heard from a crime scene technician about whether she could determine how a live round made it onto that movie set.