Research presented this weekend reinforced previous findings that 90 percent of paper money circulating in U.S. cities contains traces of cocaine. [...] A hundred percent of the sample bills collected from major cities such as Miami, Florida; Boston, Massachusetts; and Detroit, Michigan, tested positive for cocaine, but samples collected from smaller cities such as Salt Lake City, Utah; Niagara Falls, New York; and Dearborn, Michigan, had 87 to 67 percent.

WOW! That should really boost the dollar exchange rate through the roof.

90 percent of U.S. bills carry traces of cocaine [CNN]