I could answer that, if I may.
When it comes to organic production, not only do farmers bear the burden of proof, but they also bear the burden of cost. They must ensure that their product is GMO-free, and they have to bear that cost. They have to take precautions and even financial risks to establish buffer zones to protect their crops.
That is another consideration. If we want organic farming to develop, we have to help those farmers do everything they can to prevent GMO contamination.