How to I.D. Genetically Modified Food at the Supermarket

From Spence Cooper’s post at Friends Eat Blog:

For conventionally grown fruit, (grown with chemicals inputs), the PLU code on the sticker consists of four numbers. Organically grown fruit has a five-numeral PLU prefaced by the number 9. Genetically engineered (GM) fruit has a five-numeral PLU prefaced by the number 8.