FILE - In this photo taken Sept. 22, 2011, rice grows in a field near Alicia, Ark. Consumer groups are pressuring the U.S. Food and Drug Administration to set federal guidance on allowable levels of arsenic in rice, prompting the agency to consider possible new standards. (AP Photo/Danny Johnston, File)

Associated Press
FILE -  In this photo taken Sept. 22, 2011, rice grows in a field near Alicia, Ark. Consumer groups are pressuring the U.S. Food and Drug Administration to set federal guidance on allowable levels of arsenic in rice, prompting the agency to consider possible new standards. (AP Photo/Danny Johnston, File)
FILE - In this photo taken Sept. 22, 2011, rice grows in a field near Alicia, Ark. Consumer groups are pressuring the U.S. Food and Drug Administration to set federal guidance on allowable levels of arsenic in rice, prompting the agency to consider possible new standards. (AP Photo/Danny Johnston, File)