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But for schools that are willing and able to pay the price, the court's ruling provides one more weapon in the war against drugs. Oklahoma school officials say that after everything from surveillance cameras to canine patrols failed to reduce drug use, random testing was a desperate last resort--and proved the most effective deterrent of all. "Without testing for drugs, we just weren't effectively eliminating the problem," says Linda Meoli, attorney for the Oklahoma school district. "We really needed another, better tool." --With reporting by Joe Pappalardo/New York