A team of investigative reporters has discovered that the government sprayed zinc cadmium sulfide on thousands of unsuspecting citizens who lived in a St. Louis housing project during the 1950s and 60s. While the Army admits it added a florescent substance to the compound, whether or not it was radioactive remains a secret.

On the KSDK website, Leisa Zigman quotes sociologist Lisa Martino-Taylor as saying, "The study was secretive for reason. They didn’t have volunteers stepping up and saying yeah, I’ll breathe zinc cadmium sulfide with radioactive particles."
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