How is gluten-free beer made? I have a friend who is Celiac and can only drink gluten-free beer. How on earth is it made?
These beers are made with non-gluten containing grains such as millet, rice, corn, or buckwheat as opposed to glutenous grains like rye, barley, or wheat. 

As a side note, I recommend your friend give Omission Beer a try. I had it once on accident at a social event. I couldn't tell the difference between it and the real thing until I got home and looked it up online.