Voluntary labeling is obviously ineffective.
It must be mandatory.
1. Swine genes spliced into a tomato -- is that kosher? Literally, is that kosher?
2. Genetic materials from allergenic organisms spliced into normally non-allergenic organisms can have lethal results. What if you are deathly allergic to peanuts or almonds, and you eat an unrelated food which has been modified with peanut or almond genetics?
Personally, I get a severe reaction to MSG, and it is a struggle for me to interpret all the ambiguous and misleading terms which are voluntarily used to indicate glutamates in an ingredients listing.