Apparently DDT has been found in the fish and water near these two peoples.Here is a map and test data produced by the Arizona Department of Transportation (you can make it larger) showing where DDT and other chemicals have been found in the fish and waters near these two groups of people:http://www.azdot.gov/adot_and/storm_water/PDF/unique_impaired_nonattaining_waters_maps/maricopa_county.pdfHere