I was fortunate enough to hear Ms. Case speak to our local group when I was about 4 months in, and she really eased my mind. Her book is an incredible resource as well, and I can't say enough about it. She includes nutritional information about the various grains, and encourages a more whole foods vs. replacement foods approach. Some degree of logic should be used as well when researching. Would it be nice to see everything certified? Yep! But do I even bother to look at frozen or canned vegetables to see if I need to worry about cross contamination? No. Any sauces added to frozen vegetables should be done in a seperate manner from those frozen as just veggies alone, the machinery needed for each would be different. So I don't worry (At least about the veggies!)
Shauna, you are extremely sensitive, and must be very careful! I'm not saying that you are wrong in the precautions you take for yourself and your family. But we always have to trust people just a little bit too. Mission saying that their "corn products do not contain any gluten and there is no cross contamination with any other products." is a great statement. It says they do not test. Ok. Have they made (what sound like) good precautions to take care of CC? I would say so. At some point, I have to trust them, or not.
Sorry to go on there!