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The “circle of poison” (COP) describes the linkage between an American-made pesticide that is banned in the United States, but which circles back into the food supply from a pesticide used in an underdeveloped country. The circle is complete when the pesticide returns via nature or by human actions. The pesticides in the circle of poison have carcinogenic or tetragenic properties (causing birth defects). Traces of banned, American-made pesticides have been found in the Florida Keys or in other locations, including the Great Lakes. Winds and ocean currents have delivered these traces. In other cases, the pesticide circle was completed through imports of foods.

The only pesticides allowed in the United States are those that are registered for use in the United States; however, export law ...

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