http://www.nottingham.ac.uk/ncmh/BGER/pdf/Volume%2021/BGER21...
It's a 2004 report but it puts to rest the myth that GM crops are tested well enough by the FDA.
The fact is it's not in Monsanto's best interest to waste money on thorough testing.
All publicly held corporations in America (Monsanto is no exception) are legally charged with creating profit for the shareholders, even if it means screwing over consumers and the environment.
Monsanto has had this down to an art since the 1950s.