4 90 percent of U.S. bills carry traces of cocaine comentada em 05/05/2017 12:06 Assuntos Gerais 2007 em 04/05/17 11:48 comentada em 05/05/2017 12:06 " In the course of its average 20 months in circulation, U.S. currency gets whisked into ATMs, clutched, touched and traded perhaps thousands of times at coffee shops, convenience stores and newsstands. And every touch to every bill brings specks of dirt, food, germs or even drug residue.Research presented this weekend reinforced previous findings that 90 percent of paper money circulating in U.S. cities contains traces of cocaine."