https://www.federalregister.gov/articles/2013/08/05/2013-18813/food-labeling-gluten-free-labeling-of-foods

The FDA outlined products that comply with the new “gluten-free” labeling rule as:

• Foods that inherently do not contain gluten (i.e. raw carrots or grapefruit juice) may use the “gluten-free” claim.

• Foods with any whole, gluten-containing grains (i.e. spelt wheat) as ingredients may not use the claim.

• Foods with ingredients that are gluten-containing grains that are refined but still contain gluten (i.e. wheat flour) may not use the claim.

• Foods with ingredients that are gluten-containing grains that have been refined in such a way to remove the gluten may use the claim, so long as the food contains less than 20 parts per million of gluten (i.e. wheat starch).

• Foods may not use the claim if they contain 20 parts per million of gluten or more as a result of cross-contact with gluten containing grains.

Manufacturers will have until August 5, 2014, to update their labels in compliance with the new requirements. Foods labeled as “without gluten,” “free of gluten” or “no gluten” will also be held to the same standard.