Well if you buy Amy's rice crust pizza, which is clearly labelled gluten free on the box, that's when.

For sale in the gluten free freezer section of my local healthfood store I was excited to see an organic rice crust pizza for sale. Inspecting the box it clearly said "gluten free", I quickly scanned the ingredients to make sure that they hadn't used wheat starch with the gluten removed, was satisfied that it was okay, so bought it.