Environmental Research Foundation . . P.O. Box 5036, Annapolis, MD 21403 . .
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To subscribe, E-mail the words . . DDT was banned in the U.S. in the early 1970s but trace residues are still measurable nearly everywhere in the environment. All their blood samples were analyzed for DDE and PCBs. PCBs are industrial chemicals originally used as insulators in electrical equipment. PCBs were banned in the U.S. in 1976 but are still measurable in all parts of the environment.