OAK RIDGE - Four security guards at the Y-12 nuclear weapons plant were fired after testing positive for steroids, a spokeswoman for Wackenhut Services Inc., the government's security contractor, confirmed Friday. The guards' union, however, is challenging two of the cases, claiming that the positive readings were linked to use of over-the-counter supplements. News of the drug firings comes just a few days after Wackenhut confirmed that three Y-12 guards had been suspended without pay for bringing electronic game devices into the inner sanctum of the high-security weapons facility. Security police officers at Y-12 are subject to regular and random...