From Manufacturer's Website:

Our Gluten Free Ouick Oats are pure. They are grown by over 200 farmers on clean, dedicated oat-growing fields. They plant only "pedigreed" seed stock. Each farm delivery is sampled humdreds of times and tested with an R5 ELISHA gluten test to ensure the absence of gluten. Advanced color-sorting removes undetected impurities. Roasting enhances that wholesome, robust flavor you expect. The oats are packaged in our 100% gluten free facility and tested for gluten again to ensure their purity.