GM corn
GM is by no means a precise technology and scientists have no way of controlling precisely where new genes are placed among the host plant's DNA. This could be a recipe for disaster - especially if normal genes are disrupted or if foreign genes do not function properly. This in turn could affect the chemical composition of the plant and the safety of any food made from it. It is only recently that safety testing for GM foods has considered these unexpected effects, but the techniques used to work out what they might be are still not properly developed.
