Study finds 90 percent of U.S. money contains traces of cocaine

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Researchers from the American Chemical Society in Washington D.C. have discovered that up to 90 percent of U.S. paper money contains traces of cocaine. Some greenbacks had as much as 1,200 micrograms of coke, about equal in size to 50 grains of sand.

Scientists also tested banknotes from other countries and found that the U.S. and Canada had the highest levels of contamination, while China and Japan had the lowest. The figure is up by 20 percent in the States since the same team did a similar study two years ago.

The drug gets on paper money during drug transactions and when users snort the powder through rolled up notes. According to the study, bills for $5, $10, $20 and $50 tended to have higher amounts of cocaine compared to $1 and $100 notes.

While the number of tainted bills is high, the amount of coke is in fact so small that average folks need not worry about potential health, or legal, troubles.