Ruiz Marrero is founder and director of the Puerto Rico Project on Biosafety. http://bioseguridad.blogspot.com/
The main argument of defenders of products derived from genetically modified organisms (GMO's) is that the US Food and Drug Administration (FDA) determined in 1992 that they are safe and therefore need no further safety testing.
The FDA refused to allow the public to view the internal documents related to these tests, which caused in 1998 a lawsuit by a coalition of civil society and public interest groups headed by the Alliance for Biointegrity demanding that these be made public. The judge ruled in the plaintiffs' favor, resulting in the release of over 44,000 pages of documents. These show that contrary to the agency's top officials' assurances, staff scientists had major misgivings about the safety of GM foods.