I was speaking to one organic seed company rep recently, who told me they source no corn seed from the Midwest because it's likely contaminated with GMO - that is with genetically modified seed.
I also recently came across this Nation article by Lisa Hamilton, who says that virtually no corn seed in the US is GMO free. But what the article points out is that there are in fact traditional breeding techniques - through mating one plant with another - that could insert a shield to prevent GMO contamination. The only problem is, that method is now patented too.
The issue here is the privatization of seed, which is one major problem I see with sending GMO seeds to the Third World. The farmers there will be tied into the seed and chemical companies, like any addict. They will also need to invest in chemicals and irrigation networks, which only concentrates farming and takes more people off the land and into cities.