Use of robot in Dallas highlights tactical opportunities, ethical questions for police

Negotiators had been talking for hours with the hunkered-down killer of five police officers in downtown Dallas when the man suddenly resumed firing with an assault rifle. Fearing additional casualties, the officers deployed a small, remote-controlled robot to carry an explosive device near shooter Micah Xavier Johnson, which they then detonated, killing him. "We saw no other option but to use our bomb robot and place a device on its extension for it to detonate where the suspect was," Police Chief David Brown said at a news conference Friday morning. "Other options would have exposed our officers to grave danger .… We have confirmed that he's been deceased because of the detonation of the bomb."