Prefectural government officials said an organoarsenic compound was detected in rice harvested in an area of Kamisu, Ibaraki Prefecture. The area is believed to have been contaminated by toxic gas produced by the now defunct Imperial Japanese Army during World War II.
http://mdn.mainichi.co.jp/news/20040917p2a00m0dm002000c.html
The government anounces it is safe to eat, then tells farmers to withold it from the market place!