Independent testing commissioned by the Food Rights Network found toxic contaminants in San Francisco's sewage sludge "compost." In the sludge product given away free to gardeners from 2007 to March 4, 2010, are contaminants with endocrine-disruptive properties including PBDE flame retardants, nonylphenol detergent breakdown products, and the antibacterial agent triclosan. The independent tests were conducted for the Food Rights Network by Dr. Robert C. Hale of the Virginia Institute of Marine Sciences.
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