Actually, I'm pretty sure what they mean is that you can't go to a school library and check out or pick up the bible, but you could if you were in prison. But, as long as no one is forcing a child to read the bible, I can't see why having it in a school library would be bad... especially if it were with holy books of (or about) other religions. That wouldn't seem illegal to me. In any case, the kids who WANT to read the bible can surely find one at home or other places. Prisoners obviously don't have that option, so having bibles for them makes sense...