Oakland -- When Hans and Nina Reiser met at the Oakland Police Department to exchange their children, their exchanges were so hostile that one officer recommended she get a gun, according to courtroom testimony today. Retired Oakland police Officer Ben Denson testified that the enmity between the two was apparent when they used the downtown police headquarters to pick up and drop off their children in 2005. "It was almost an ever-present thing," Denson testified in Alameda County Superior Court. "They rarely talked for any length of time, but when they did engage in face-to-face conversation, it was my impression...