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Here's a summary of this Codex/GMO article:
http://www.asil.org/insights/insigh51.htm
by The American Society of International Law

ASIL Insights   Implications of Codex Standards for the
Regulation of Genetically Modified Food
          By Judson O. Berkey

"The Codex Alimentarius (Codex) is a commission jointly sponsored by the
Food and Agriculture Organization (FAO) and the World Health
Organization (WHO). Codex adopts standards that may be used by its 162
participating governments to develop national regulations.  Codex is
currently developing a variety of international standards for the trade
of genetically modified food (GMF).1 Codex has three committees that are
considering various issues related to GMFs. These committees are the
following: 1) Codex Committee on Food Labeling (CCFL);
2) Codex Committee on General Principles (CCGP); and 3) Ad Hoc
Intergovernmental Task Force on Foods Derived from Biotechnology
(Task Force)."