[USA] Sewage tells tales about community-wide drug abuse / EurekAlert!, 21 August 2007
http://www.eurekalert.org/pub_releases/2007-08/acs-stt081007.php
"Public health officials may soon be able to flush out more accurate estimates on illegal drug use in communities across the country thanks to screening test described at the 234th national meeting of the American Chemical Society. The test doesn’t screen people, it seeks out evidence of illicit drug abuse in drug residues and metabolites excreted in urine and flushed toward municipal sewage treatment plants."