Dallas police used a robot to kill a gunman, a new tactic that raises ethical questions

"As police departments acquire more robots that were once seen only in war zones, civilian law enforcement officers are pushing into territory forged by the CIA and the U.S. Air Force to kill terrorists, said Ryan Calo, an assistant law professor at the University of Washington in Seattle and an expert on robotics and the law.   

“This is not the beginning of killer robotics, domestically, but it is hard to distinguish this and a drone strike,” Calo said. “The police had exhausted their other options, they thought.”

Like in the military’s lethal drone program, “they are also trying to minimize collateral damage here. They don’t want to risk officers’ safety,” he said. "