The discovery of GMO contamination in Mexico was surprising because the Mexican government imposed a moratorium on genetically modified corn in 1998. Researchers could not prove how the contamination happened, but they assume that GM maize, given as food aid, may have been planted. They do not believe that cross-pollination could have happened over long distances.
Mexican authorities have been aware of the contamination for several months. The Mexican National Institute of Ecology in the states of Oaxaca and Puebla found contaminated varieties in 15 of the 22 communities tested, at levels from 3 to 10 per cent.



