source PLU Codes Do Not Indicate Genetically Modified Produce PLU Codes Do Not Indicate Genetically Modified Produce is completely optional reliably tell reliably tell PLU Codes Do Not Indicate Genetically Modified Produce at least with regard to identifying GMOs use of the prefix is optional Source use of the prefix is optional PLU Codes Do Not Indicate Genetically Modified Produce PLU Codes Do Not Indicate Genetically Modified Produce Huffington Post PLU Codes Do Not Indicate Genetically Modified Produce wrote that this PLU practice is a “myth,” argues PLU Codes Do Not Indicate Genetically Modified Produce PLU Codes Do Not Indicate Genetically Modified Produce reliably tell PLU Codes Do Not Indicate Genetically Modified Produce producers are not using the proper GMO PLU wrote that this PLU practice is a “myth,” PLU Codes Do Not Indicate Genetically Modified Produce