In the last two weeks, two men have died after being restrained by police officers, one in Minneapolis and one in St. Paul. In both cases, the police used non-lethal methods to take them into custody. Investigations and autopsy results are pending. Studies show that generally, there's not just one factor that leads to the fatality in these situations. Some say police officers can avoid these kinds of deaths, through better training. But law enforcement officials say police custody deaths are rare and the use of this kind of force is sometimes the only way to handle a violent suspect.