By October 1945, DDT was available for public sale in the United States, used both as an agricultural pesticide and as a household insecticide.  Although its use was promoted by government and the agricultural industry, US scientists such as FDA pharmacologist Herbert O. Calvery expressed concern over possible hazards associated with DDT as early as 1944.    In 1947, Dr. Bradbury Robinson , a physician and nutritionist practicing in St. Louis, Michigan , warned of the dangers of using the pesticide DDT in agriculture. DDT had been researched and manufactured in St. Louis by the Michigan Chemical Corporation , later purchased by Velsicol Chemical Corporation ,  and had become an important part of the local economy.  Citing research performed by Michigan State University  in 1946, Robinson, a past president of the local Conservation Club,  opined that:
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