On August 2, 2013, FDA issued a final rule defining “gluten-free” for food labeling, which will help consumers, especially those living with celiac disease, be confident that items labeled “gluten-free” meet a defined standard for gluten content.
From the Food and Drug Administration: GF Labeling Information and “Gluten-Free” Food Facts
From the Beyond Celiac: The FDA’s Ruling On Gluten-Free Food Labeling