I could be wrong here, but this is how it was explained to me by my farmer husband when I questioned this. I is because of the possibility of cross-contamination with farming equipment. What if there was one grain of wheat left in the combine before they harvested the oats? I think with the Gluten Free Oats or Cheerios the combine would be guaranteed to be clean. Also when planting the seed oats are certified to be clean and wheat free.Quaker oats says on the package, "100% oats." Oats do not contain gluten. So why did they come out with "Gluten Free Oats"? Well, it seems that there is a small chance that there might be something -- barley, wheat, or rice -- sneaking in. Even a grain or two is enough to be a problem for some people. But percentage-wise, it would be small enough that they could still -- legally -- say, 100% oats.
If I'm wrong, please someone correct me.
We know three brothers who farm. Two work together and share equipment. The other brother farms alone. He is certified organic. They could share equipment but would have to be extremely careful in cleaning the planting and harvesting equipment before moving from the conventional to organic fields.