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Researchers from the University of Massachusetts at Dartmouth conducted chemical tests on banknotes from 30 cities in five countries: Canada, the United States, Brazil, China and Japan.
They found the highest levels of cocaine on U.S. and Canadian currency, which had an average contamination rate of between 85 and 90 per cent.
For their research, Zuo and his colleagues analyzed 234 U.S. banknotes and found that up to 90 per cent contained traces of cocaine.
Amounts ranged from .006 micrograms (which is several thousands of times smaller than a grain of sand) to more than 1,240 micrograms of cocaine (about 50 grains of sand).
But the highest levels were found on Canadian notes, with amounts ranging from 2.4 micrograms to more than 2,530 micrograms.