Just to add a little updated light to this subject.
My boyfriend was sentenced to a correctional facility (jail with daily work release, more or less) today. His lawyer was pleading down the number of days and using Celiac's/Gluten Intolerance as a reason why he should not serve the full recommended 30 days. Well in the end, the judge ruled that Gluten Intolerances are very common now and that the facility would be able to support him. I have not heard from him yet how the food is or if they even make an effort to cater towards the gluten-free inmates but I will keep you guys posted. From what the Judge said, it sounds like they might in some places now.