As kids prepare for the next mass shooting, experts say high-tech surveillance, tactical gear, and live drills are doing more harm than good — On August 3, just after 8 a.m., a gunman in a green hoodie, dark sunglasses, and a camouflage face mask quietly entered Boyle County High School, located outside Danville, Kentucky. He dropped a small explosive by a side door, entered the cafeteria, and began firing rounds from his shotgun.