Or they could be like Freedom foods and have a completely gluten free factory...
I hate to be the one to tell you this but as far as I know there is no "gluten-free factory" in existence. Contamination can happen anywhere in the supply chain, including but not limited to the field where the gains are grown, during transportation, at the mill when they are ground into flour (very common), etc., and many so called gluten-free facilities are therefore no better than their counterparts who take steps and clean lines and machinery. The only way to decide if something is gluten-free is to batch test it at the end. I am not aware of any company anywhere that grows their own grains and grows or makes all of their own ingredients they use, and does all the processing on them. They would also have to restrict employees from bringing gluten to the workplace. In my opinion that is what it would take to make the claim that their facility is 100% gluten-free.
Also, for those who are super sensitive and have explored all of their other food intolerance issues, and have made sure their diet is 100% gluten-free, I have some bad news: You could be in the refractory sprue category, which is a whole different issue and requires additional medical treatment. For people in this category the proposed 20ppm regulations will be better than what we have now, but in reality only additional and more aggressive medical treatment is likely to improve their condition. Here is more info on that: