Almost 90% of US and Canadian paper money contains measurable amounts of cocaine.
Scientists report that cocaine is present in up to 90 percent of paper money in the United States, particularly in large cities such as Baltimore, Boston, and Detroit
95 percent of the banknotes analyzed from Washington, D.C. contained traces of cocaine.
Scientists tested banknotes from more than 30 cities in five countries, including the U.S., Canada, Brazil, China, and Japan, and found evidence of cocaine use in many areas.
The U.S. and Canada had the highest levels, with an average contamination rate of between 85 and 90 percent, while China and Japan had the lowest, between 12 and 20 percent contamination.
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