Such sterile fields will offer little or no food or shelter to wildlife, and there is already evidence that the genes for herbicide resistance can spread to wild relatives of crop plants, leaving us with weeds resistant to weedkiller.

BBC: Prince Charles speaks out against GM food

At the moment, when food inspectors investigate a report of tainted food, they place the offending morsel in a sterile container and take it to a lab for analysis.

BBC: Rapid food poisoning analysis