Zinc Cadmium Sulfide and Chemtrails

Congress asked the National Research Council to study whether zinc cadmium sulfide might have caused harm. They concluded that even though high doses of cadmium could cause cancer, bone, and kidney problems, there was no evidence that the levels sprayed over the test sites could cause health problems. That conclusion is still disputed within the scientific community. The bottom line is, even if zinc cadmiam sulfide was toxic, the military wasn't aware of it during the tests.