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While by and large these lists are quite helpful one must exercise
vigilance especially when it comes to foods that are going to be eaten in
large amounts or often.  If you are planning on eating something on a
regular basis you must not only ensure that it gluten free at the outset
but recheck it every 2-3 months.  Things change.
For large lists such as the CSA/USA lists especially if they are garnered
from many individuals efforts will have occassional mistakes either
because the company rep did not understand what GF was exactly ( may have
the bakers definintion of gluten or not not considered barley as "gluten"
Oats and oat flour are best avoided as a routine food ingredient for
celiacs.  Joe Murray Iowa