From what I read here, posted by a few of the Non GMO advocates, THEY don't fully understand the record keeping/certification it takes to truly qualify as "organic". It seems some think just badmouthing what they don't understand is enough to qualify them as organic farmers. There's a great deal to actually being CERTIFIED ORGANIC. And when push comes to shove, they're EITHER Certified organic, or they aren't really organic, just claiming so to capitalize on a fad.
That said, so long as they have PROPER documentation, and their crops test free of GMO proteins, it is a lot of "good faith" and there is a LOT of room for rule bending.