The FDA released a study which turned up arsenic in chickens treated with a drug called 3-Nitro or Roxarsone. The drug manufacturer, Pfizer, voluntarily stopped sales. Roxarsone has been used since the 1940s in poultry production to treat "a parasitic disease that affects the intestinal tracts of animals" as well as "for weight gain, feed efficiency and improved pigmentation". Farmers are expected to transition to new methods of treatment.
Via: FDA: Pfizer will voluntarily suspend sale of animal drug 3-Nitro.
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