A transgenic salmon has ushered in a wave of legislation requiring labels for genetically modified foods. What's your state doing?
There's basically no way to tell if your food has been genetically modified. Or, for that matter, no way to tell if it was grown from a plant once doused with radiation. There are no labeling requirements for heirloom crops either. Genetics just hasn't been something most of us think about when we're hunting the supermarket for a meal.