I have a daughter that has Celiac Disease. She can have adverse reactions by even mixing bisquit dough without gloves. I never paid much attention to "Gluten Free" until my daughter was diagnosed.
I have had a catering customer ask me if the meat was "Gluten Free" I had cooked tri-tip and chicken ---he was concerned that the chicken was breaded. Most BBQ sauces contain gluten due to thickening agents. It is a good idea to read labels. He ate the meat and was happy.