Some few organic growers are unscrupulous, and don't care if they use GM, or if they grow using non-organic practices, if its easier for them to make a buck.
The bigger worry though, is contamination of clean crops. I recently read a story about an organic producer who lost his entire contract when the buyer discovered that a small percentage of the crop was made up of GMO when analyzed before accepting delivery. The grower was totally unaware that this had occurred. Which local HFSs or small organic farmers are doing DNA analysis of their produce? Once this stuff is out in the field, it spreads. How will we know by looking at it if its been contaminated with GMO or not?
There are a few vegetables that are self-pollinating, like potatoes, so if not GM to start with, they wouldn’t suddenly change. But most are not; and that’s a big problem. I guess veggies we use pre-pollination, pre-fruiting, like lettuce, could be considered safe from this kind of contamination.
Seeds of Doubt:
North American farmers' experiences of GM crops
Soil Association 17sep02
In chapter 7 we look at GM contamination, which has been the single greatest problem. Widespread GM contamination has occurred rapidly and caused major disruption at all levels of the agricultural industry, for seed resources, crop production, food processing and bulk commodity trading. It has undermined the viability of the whole North American farming industry:
Contamination has caused the loss of nearly the whole organic oilseed rape sector in the province of Saskatchewan, at a potential cost of millions of dollars. Organic farmers are struggling practically and economically; many have been unable to sell their produce as organic due to contamination
All non-GM farmers are finding it very hard or impossible to grow GM-free crops. Seeds have become almost completely contaminated with GMOs, good non-GM varieties have become hard to buy, and there is a high risk of crop contamination
Because of the lack of segregation, the whole food processing and distribution system has become vulnerable to costly and disruptive contamination incidents. In September 2000, just one per cent of unapproved GM maize contaminated almost half the national maize supply and cost the company, Aventis, up to $1 billion.
Here is a listing of articles on genetic engineering in the last 6 months.