<<Disclaimer: Verify this information before applying it to your situation.>> The more I find out about what foods to avoid, I am faced with the question, "How is it known to contain gluten?" Is there testing going on to find gluten molecules in things like malt vinegar, deep frying oils in restaurants, grain alcohols, etc.? Is it proven that foods are contaminated by deep frying in oil that breaded products are? Is gluten found chemically in vinegars? Are there ways to test foods and does anyone do this kind of testing for the celiac societies? Because there are varying opinions on what is gf, I am wondering how is it tested and where does this info originate from? Thanks. I will summarize. Susan HD Thunder Bay Ontario