Britt Bailey, Director of Environmental Commons, discusses potential state-level laws for the labeling of GMOs:

Now, four states are carrying bills making the agricultural biotechnology industry liable in the event another contamination occurs. Three states are hearing bills calling for a moratorium on food crops genetically engineered to produce pharmaceuticals. Illinois and Tennessee are calling for labeling of foods derived from genetically engineered crops. Five states, California, Hawaii, Minnesota, New York, and South Dakota, are calling for notification systems in which genetically modified foods become a part of the public record.

For the full piece see: States Introduce Numerous Bills to Regulate Genetically Modified Foods.