Few industry debates are as heated these days as the one about labeling foods that contain genetically modified ingredients.

And while interest groups and advocates wage war in state legislatures, on ballots and in Congress over what should be disclosed on product labels, products certified as containing no genetically modified organisms are proliferating on grocery shelves without any nationwide mandatory regulations.

Moreover, many manufacturers are nodding to the public debate, adding the phrase “non-G.M.O.” to their packaging without a verification process.

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