Argument: Labeling requires separate processing of GM and non-GM foods
"Labelling of GM foods. Pros and Cons of Major Labelling Approaches." Think Quest: "A At present, GM crops/foods and non-GM crops/foods are often mixed together during harvesting, storage or processing. It would be necessary to establish a system to segregate these crops along the food supply chain, especially when the trade would like to source for non-GM food products. Hence additional cost would be incurred to establish and maintain segregation systems."