Quite so. However, the chance of contamination is far higher in a facility that does process products with gluten. I did not mean to imply that a gluten free facility was a guarantee of a gluten free product.
It nearly impossible to certify a product as truly gluten free if it is manufactured in a facility that make other products that contain gluten. The currently available tests for manufacturers to use have a lower sensitivity limit of about 10 parts per million. In order to provide a margin for error the limit is set at 20ppm. That isn't very much and for...