Denne valgfrihed forudsætter dog et strengt og sikkert mærkningssystem, hvor det angives, om produkterne består af eller indeholder genetisk modificerede organismer, men også, om produkterne er fremstillet af disse organismer eller ved hjælp af disse organismer.
However, this freedom of choice presupposes a rigorous, unambiguous labelling system which informs the consumer whether products contain genetically modified organisms, whether they are composed of genetically modified organisms, and also whether they have been derived from GMOs or whether GMOs have been used as processing aids.