Saint Louis - Previously classified documents reveal new details about how and where the US Army sprayed chemical agents over thousands of unwitting residents of St. Louis, Missouri during the 1950s and 60s as part of a series of Cold War experiments.
The spraying was meant to simulate the airborne dispersal of biological warfare agents. Residents were not told that they were being sprayed with zinc cadmium sulfide.
Zinc cadmium sulfide was but one of many toxic substances to which unwitting troops and civilians were exposed during Cold War chemical and biological weapons experiments. During Project SHAD, the crews of more than a dozen Navy warships were exposed to sarin (the nerve gas that killed 12 people in the 1995 Tokyo subway gas attack), VX nerve gas (which the Pentagon calls "one of the most toxic substances ever synthesized) and serratia marcescnes, which can cause serious infections including pneumonia.
The Army also released a massive cloud of Serratia marcescnes over the San Francisco Bay Area in 1950, resulting in an outbreak of illnesses in which one person died.