[12][13] In June 2011, the manufacturers suspended sales of roxarsone in the U.S. and Canada in response to a study by the Food and Drug Administration (FDA).

[16] An FDA press release stated that the findings raised "concerns of a very low but completely avoidable exposure to a carcinogen.

"[14] A 2013 market basket study conducted in the United States linked the use of roxarsone and other arsenical feed additives to increased levels of inorganic arsenic in chicken breast meat, albeit at concentrations well below danger levels set in federal safety standards.

Organic chickens not exposed to arsenical feed additives contained about half a part per billion.

The study was performed on chickens raised prior to the voluntary withdrawal of Roxarsone from the market by its manufacturer in June 2011.