Stream in Baltimore, Md. (IMAGE) Cary Institute of Ecosystem Studies Caption As part of the Baltimore Ecosystem Study, researchers collect stream samples to assess pharmaceutical pollution. Credit photo credit: Sylvia Lee Usage Restrictions To promote this press release. License Licensed content Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.