In 1961, representatives from 73 nations met at United Nations headquarters to draft an international treaty to fight the production, trade, and use of illegal drugs. Their comprehensive convention replaced a prior patchwork of treaties and was entered into force in 1964. It was amended in 1972 and now has more than 180 signatories. Despite its sweeping breadth, the document contains a significant ambiguity that has been interpreted differently by various nations. What is it? Discuss
Source: The Free Dictionary