A tribunal of trade arbitrators has ruled in favor of the United States in its complaint that Mexicoâs restrictions on genetically modified corn violate the terms of the U.S.-Mexico-Canada trade agreement, or USMCA. The long-awaited ruling in the 16-month trade dispute is unlikely to settle the questions raised by Mexico about the safety of consuming GM corn and its associated herbicide.
Indeed, the pro-U.S. ruling raises questions about the fairness of the USMCA itself, which has now legitimized the use of the agreementâs dispute process to challenge a domestic policy that barely affected trade. U.S. President-elect Donald Trump is now openly threatening Mexico with 25% tariffs on all Mexican exports, a blatant violation of the USMCA that Trump himself renegotiated and signed in 2018. Yet the treaty appears impotent to challenge such unilateral U.S. trade measures just as its tribunal slaps Mexicoâs hand for its public health policies.
According to the U.S. government, the final report from the tribunal, announced December 20, ruled that âMexicoâs measures are not based on science and undermine the market access that Mexico agreed to provide in the USMCA.â In fact, the trade panelâs ruling was more limited, demanding that Mexico comply with the trade agreementâs procedures for carrying out risk assessments based on ârelevant international scientific principles.â
Countries considering entering into trade agreements with the United States may now be more reluctant to do so if their domestic policies can be challenged in a trade court.
The Mexican government defended its position but vowed to comply with the ruling. âThe Government of Mexico does not share the panelâs determination, as it considers that the measures in question are in line with the principles of protection of public health and the rights of Indigenous peoples, established in national legislation and in the international treaties to which it is a party,â read a statement following the ruling.
The ruling will not settle the debate over the health and environmental risks of GM corn and its associated herbicides, In the course of the dispute, Mexico produced extensive peer-reviewed scientific evidence that showed ample cause for precaution given the risks associated with both GM corn and its associated herbicide glyphosate. Recent studies have shown negative health impacts to the gastrointestinal tract and potential damage to the liver, kidneys, and other organs.
â[We] did an exhaustive review of the scientific literature,â explained MarÃa Elena Ãlvarez-Buylla, the molecular geneticist who led Mexicoâs national science agency, CONAHCYT, until October. âWe concluded that the evidence was more than sufficient to restrict, out of precaution, the use of GM corn and its associated agro-chemical, glyphosate, in the countryâs food supply chains.â
That evidence was presented in great detail to the tribunal in Mexicoâs formal filings during the process, and it has now been published as a âScience Dossier.â It represents one of the most comprehensive reviews of the scientific evidence of the risks of GM corn and glyphosate to public health and the environment.
For its part, the U.S. government declined to present evidence that its GM corn with glyphosate residues is safe to eat in Mexico, where corn is consumed at more than 10 times the levels as in the United States and in minimally processed forms such as tortillas, not in processed foods.
âThe research on the part of the U.S. was quite poor,â says Dr. Ãlvarez-Buylla, noting that U.S. research was outdated, ignored many recent studies, and depended on science that is âfull of conflicts of interest.â
The U.S. government also failed to produce any evidence that Mexicoâs February 2023 presidential decree had any meaningful impacts on U.S. exporters. U.S. corn exports have increased since the decree was enacted, not shrunk. The measures restricted only GM white corn use in tortillas, less than 1% of the U.S. corn exported to Mexico.
Early on in the dispute, Mexican Economy Minister Raquel Buenrostro stated that the U.S. needed to show âquantitatively, with numbers, something that has not occurred: that the corn decree has commercially affectedâ U.S. exporters. The U.S. has yet to produce any such evidence.
Meanwhile, president-elect Trumpâs threatened tariffs are blatantly illegal under the USMCA and promise to inflict massive economic harm on Mexican exporters, and on U.S.-based firms that produce in Mexico.
The pro-U.S., pro-agrochemical industry ruling will ripple far beyond this dispute. Mexicoâs documentation of the evidence of risk from GM corn and glyphosate should prompt consumers and governments the world over to take a closer look at these controversial products, and at the lax U.S. regulatory processes exposed by Mexico.
Countries considering entering into trade agreements with the United States may now be more reluctant to do so if their domestic policies can be challenged in a trade court. Kenya has been negotiating a trade agreement with the United States. Kenyans are already concerned the agreement will open Kenya to GM animal feeds, says Anne Maina of the Kenya Biodiversity and Biosafety Association. If the agreement can be used to challenge domestic policies, she says, it will be even less palatable.
It remains to be seen how the Mexican government will comply with the ruling. It has 45 days to respond. Already, President Claudia Sheinbaum has reiterated her support for a constitutional amendment to enshrine a ban on GM corn cultivation and consumption in tortillas. A âRight to Foodâ law passed last year mandates labeling of foods containing GMOs. No tortilla seller wants such a label on its products, because Mexican consumers are clear that they do not want GM corn in their tortillas.
The tribunalâs ruling will not undo the fact that Mexicoâs precautionary policies are indeed justified by a wealth of scientific evidence. By allowing the trade agreement to undermine a domestic policy that barely affects trade, it will further tarnish the legitimacy of an agreement already seen as favoring multinational corporations over public health and the environment.