U.S. Army's secret Cold War experiments on St. Louisans --'This was a violation of all medical ethics, all international codes, and the military's own policy at that time.' 25 Sep 2012 The KSDK I-Team independently verified that the spraying of zinc cadmium sulfide did take place in St. Louis on thousands of unsuspecting citizens. What is unclear is whether the Army added a radioactive material to the compound as sociologist Lisa Martino-Taylor's research implies. Army archive pictures show how the tests were done in Corpus Christi, Texas in the 1960s. In Texas, planes were used to drop the chemical [the precursor to chemtrails]. But in St. Louis, the Army placed chemical sprayers on buildings and station wagons.