The Germans are so weird AND so clever! Der Spiegel reports that the Institute for Biomedical and Pharmaceutical Research in Nuremberg foraged various rivers in Europe and the U.S. to find the "substance produced by the human body during cocaine consumption." And when they hit the Hudson River, apparently the numbers were through the roof for consumption, when taking into account statistics for drug use:

For example in New York, IBMP teams searched the Hudson River and found the by-products of a projected cocaine consumption totaling 16.4 tons per year. There are approximately 3.4 million people aged 15 to 65 living in the Hudson's watershed. According to the United Nations "World Drug Report," 2.8 percent of Americans in this age group use cocaine at least once a year. That would mean that about 95,000 people are responsible for an annual consumption of 16.4 tons of pure cocaine -- a per capita rate of 172 grams per year. more ›