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Baltimore environmental activist Glenn Ross, talks to the Associated Press, Monday, Aug. 20, 2007 in Baltimore, Md. Scientists using federal grants spread fertilizer made from human and industrial wastes on yards in poor, black neighborhoods in Baltimore to test whether it might protect children from lead poisoning in the soil. Families were assured the sludge was safe and were never told about any harmful ingredients. Ross says choosing poor neighborhoods destined for demolition makes it hard to track a study's participants. "If you wanted to do something very questionable, you would do it in a neighborhood that's not going to be there in a few years," he said. (AP Photo/Manuel Balce Ceneta)
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