gandracu writes "It appears that a variety of genetically modified maize produced by Monsanto is toxic for the liver and kidneys. What's worse, Monsanto knew about it and tried to conceal the facts in its own publications. Greenpeace fought in court to obtain the data and had it analyzed by a team of experts. MON863, the variety of GM maze in question, has been authorized for markets in the US, EU, Australia, Canada, China, Japan, Mexico, and the Philippines. Here are Greenpeace's brief on the study and their account of how the story was unearthed (both PDFs)."