Onstage Murder Could've Been Prevented, Security Experts Say Concert venues need trained staff and metal detectors, they insist. The onstage murder of "Dimebag" Darrell Abbott leaves not just Damageplan fans, but concertgoers everywhere, with many troubling concerns. Chief among them was that the tragedy might have been prevented for less than $50, the price of a handheld metal detector. "It should have been a common practice. It should have been something they had," said Paul Wertheimer of Crowd Management Strategies, a consulting firm specializing in concert safety. "If it was used right, it would have caught the gun and you...