Thai officials announced in November the largest ketamine bust in the nation's history, some 11.5 tons of the anesthetic. They now say they were wrong. The white powder was all actually trisodium phosphate, a cleaning agent. Officials blame a field test that inaccurately indicated the powder was a drug. A government spokesman says it "might have been premature to hold a press conference" touting the bust before doing full lab tests on the powder.