Sure Stacey, I'm no expert but I'll share what I do know.
Herbicide toxins for example are spliced into the DNA of a variety of crops. Having said that the plants start producing the chemical themselves, and inturn you injest it. There is a potato, produced by Monsanto that is currently registered as a pesticide. I can't remember the name of it though but I'm sure a search on google could turn it up.
The herbicide toxins are present in every gene in these crops they cannot be cooked, washed, peeled off by any means. This is even worse then spraying the herbicide on the plants as the dosage is multiple times higher this way.
This effects not only the crops but the entire food chain. It's a very interesting topic that I've become more concerned about over the past 4/5 years.
Cats only have nine lives because they stole them from dogs!Teehee