On October 9, 2018, Organic Consumers Association (OCA) reported the presence of the chemical glyphosate and AMPA, its main metabolite, in Maseca-brand white and yellow corn flour samples purchased in different regions of Mexico. Some flour samples tested as high as 94.15 percent for the presence of genetically modified organisms (GMO).
Testing was conducted by Health Research Institute (HRI) in Fairfield, Iowa (U.S.), on behalf of Organic Consumers Association Mexico (ACO). HRI specializes in detecting and quantifying substances in food, water, soils and even the human body. Tests are performed using accredited standards, rigorous quality assurance processes and advanced technologies.