Genetically modified (GM) corn not approved for sale in Europe has been found in four supermarket brands of tortilla chips sold in Britain and Denmark, according to Friends of the Earth (FoE), which commissioned tests of the products. The four supermarkets, all of which claim their chips are GM-free, launched investigations into the claims yesterday. The corn is grown and sold in the U.S. for human consumption, but is supposed to be kept out of the European food stream. If FoE’s findings are confirmed, they could spark new controversy over controls on GM crops and further discourage Europeans from importing American corn. Meanwhile, Americans seem to be growing more cautious about GM crops, particularly following recalls of products found to illegally contain StarLink corn, which has not been approved for human consumption. In a recent U.S. poll, 33.3 percent of respondents said farmers shouldn’t be allowed to plant GM crops.