California failed to pass Proposition 37, which would have required labeling of foods that contain genetically modified ingredients. This came as a surprise given the initial public support, though the money raised by the opposition managed to sway voters in the end. For a law that would not have outlawed anything, just required labeling, it’s really sad California couldn’t get this passed.
I feel it’s inevitable that laws like this will come to be…and until then, if this is an issue you care about, shop for organic fruits and vegetables, and check out the Non-GMO Shopping Guide for more shopping advice. In general, unless labeled as being Non-GMO (see label above), avoid corn, soybeans, canola, cottonseed, sugar beets, Hawaiian papaya, and ingredients derived from these (like ‘sugar’, instead of ‘pure cane sugar’, as it is likely to have some GM sugar beets in it).