A_656 - Some packaged foods, in addition to the list of ingredients, include the words "may contain..." or "may contain traces of...". Generally, there's no need to worry about those types of ingredients, even if they're of animal origin. Food manufacturers list them to be on the safe side, but industrial production facilities have one or more dedicated plants for each individual type of product, and these words are included only because they produce foods with that type of ingredient in the same facility. The truth is that possible contamination is so unlikely that, in my opinion, you can really rest easy if you don't have any lethal intolerances.