Warren's death raises the Taser-related death toll in the U.S. to at least 500.
Warren was unarmed. And that is not uncommon. In fact, a 2008 report by Amnesty International (AI) examined data on hundreds of deaths related to police Taser use and found that an alarming number of those who died were unarmed.
According to the report, "Tasers are frequently deployed in situations where firearms or other weapons would not be an option. For example, police have used Tasers on unarmed people who fail to comply immediately with instructions, who struggle while they are being handcuffed or who try to run or walk away from minor incidents.