Many concerned citizens would like to know whether or not their food contains GMOs (genetically modified organisms). Ideally, these modified foods will eventually be labeled, but until then there is a way to know if your produce has been altered or not. Marion Owen, co-author of Chicken Soup for the Gardener's soul breaks it down on her site. It turns out that the PLU (price look up) code on produce stickers, is a sort of decoder ring.
The breakdown: Organic fruits and veggies have a five number code which begins with the number nine. GMOs are also five numbers, but start with eight, and conventional produce simply has four numbers.