The other thing to watch with children who are gluten free (which can also include children with autism who are on special diets) is the use of playdough, flour and water paste, and other messy play activities (e.g. pasta play) where they might be tempted to eat the spaghetti.

I once supported a child with autism on a GF diet and the school were fab at remembering to ensure he got his special snacks / meals / the children were aware not to share their foods with anyone as different foods made different people feel poorly, the teacher generally remembered to inform me / his parents about cooking activities so we could sort out alternative ingredients / activities but constantly forgot about the other messy play activities as it wasn't 'eating' but as we all know it may not be planned eating but the children do it anyway!