Officer Jeronimo Yanez is expected to take the stand this afternoon in his manslaughter trial in Saint Paul. Before the defense called their key witness to the stand, use-of-force expert Emanuel Kapelsohn testified that Officer Yanez was justified in shooting Philando Castile. The prosecution contends the ultimate question is whether Castile was producing a gun when Yanez shot him. Kapelsohn argued that Yanez reasonably believed that Castile was pulling out a firearm and added it’s ultimately up to the jury to decide if Yanez is telling the truth.