A Los Angeles judge blocked Southern California Edison's plan to impose unscheduled drug testing on 2,000 employees at the San Onofre nuclear power plant. U.S. District Judge Harry Hupp issued a preliminary injunction that will remain in effect until an arbitrator rules on whether the new plan to require urine tests on 24-hour notice violates Edison's contract with the Utility Workers Union of America. "It's definitely a victory," said Glenn Rothner, an attorney for the union. He estimated an arbitrator's decision would take from six months to two years. The union claims that the tests should not be instituted without collective bargaining. The union won a temporary restraining order against the testing plan from a Superior Court judge in December. The case has since been transferred to federal court.