Qdoba Mexican Grill is a fast food restaurant located at 2222 Walnut Street in Cary and in Beaver Creek Commons in Apex. In addition to a very complete listing of common allergen information (including Wheat and Other Glutens) http://www.qdoba.com/Allergens.aspx, they provide a comprehensive list of ingredients (even indicating that maltodextrin is from corn) http://www.qdoba.com/Documents/allergen.pdf .
From their website:
At Qdoba, we care about giving you the information you need to make informed decisions about eating. Food intolerances make these decisions even more important. Ingredients like wheat, soy, milk, eggs, nuts and fish are found in certain food items served at Qdoba.