When I called to inquire, I was informed that Mazatlan's one fryer is cleaned daily and that new oil is used daily. The corn chips are all fried first thing in the morning and are placed in a warmer. Anything else that is fried in the fryer is only done after all the chips for the day have been fried. I was also informed that they know the quantity of corn chips needed and that they never run out and therefore do not need to fry additional corn chips later in the day. This process enables them to refer to the corn chips as "gluten free" but they do acknowledge that there is no separate designated fryer in the kitchen.