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<p>It is totally unaceptable to watch Mr. Antonio-Maria Costa, the Executive Director of the UN Office on Drugs and Crime,fail to give any answer to Dr. Frederick Polak a pyschiatrist working within the drug field in the Netherlands. Dr. Polaks question, was in the first instance evaded and then when he persisted with his question, which was pertinent to the occasion Dr. Polak's microphone was switched off. He was silenced.</p>