How to clear confusion from food allergy warnings

(AP) -- It's one of the biggest frustrations of life with food allergies: That hodgepodge of warnings that a food might accidentally contain the wrong ingredient. The warnings are voluntary - meaning there's no way to know if foods that don't bear them really should. And they're vague: Is "may contain traces of peanuts" more reliable than "made in the same factory as peanuts?"

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