美国90%纸币携带可卡因痕迹（2009年）
2009年研究发现，美国流通纸币中高达90%检测出可卡因残留，主要原因是纸币在毒品交易中流通或被吸毒者通过吸管接触污染。这项研究揭示了毒品污染在日常货币中的普遍性。
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