But, what about testing the ingredients
Sadly, the rule does not specifically require the manufacturer to test their ingredients or their finished products for the presence of gluten. Nevertheless, it is the manufacturer’s responsibility to ensure that their food products indeed meet the final rule requirements. So, it would actually be best for them to participate in a 3rd party gluten-free certification program or request a gluten analysis certificate from their ingredients supplier.
Complying with the rule is actually a good thing for manufacturers. After all, staying true to whatever they put on their product’s packaging will help them acquire their customer’s trust. It will also help their customers make a wise choice in buying foods that may put their health at risk.