Some of the info I did read, just a quick reference to wiki:
'Coeliac disease
Coeliac disease, or celiac disease, is a disease often associated with ingestion of wheat, or more specifically a group of proteins labelled prolamines, or more commonly, gluten. Oats lack many of the prolamines found in wheat; however, oats do contain avenin.[7] Avenin is a prolamine that is toxic to the intestinal mucosa of avenin-sensitive individuals and can trigger a reaction in these coeliacs.[8]
Further information: Avenin-sensitive enteropathy
Although oats do contain avenin, there are several studies suggesting that oats can be a part of a gluten-free diet if it is pure. The first such study was published in 1995.[9] A follow-up study indicated that it is safe to use oats even in a longer period.[10]
Additionally, oats are frequently processed near wheat, barley and other grains, such that they become contaminated with other glutens. Because of this, the FAO's Codex Alimentarius Commission officially lists them as a crop containing gluten. Oats from Ireland and Scotland, where less wheat is grown, are less likely to be contaminated in this way.[citation needed]
Oats are part of a gluten-free diet in, for example, Finland and Sweden. In both of these countries there are "pure oat" products on the market.
Further information: The oat controversy in gluten sensitivity'