I think this will be very hard to determine if you have GMO.  When harvest time comes around, ALL farmers, no matter organic, family farm, or corporate dump their grain in the same elevator and it gets mixed together.  The only way to seperate the grains from GMO to organic is to have seperate elevators and each farm will have to have their grains certified either organic or GMO.  The cost would be building new elevators, ship grain in sepreate rail cars, and processed in seperate factories.  The result would be to drive food costs up to the point that it would be very expensive for the consumer.  I too don't want to eat Bio-toxiin corn.  But until everyone demands clean food at affordable cost we will be stuck with GMO.