Each section of the OMRI Generic Materials List (crops, livestock, and processing) states:

"The use of genetically engineered organisms or their products are prohibited in any form or at any stage in organic production, processing, or handling."

OMRI currently uses the U.S. National Organic Standards Board definition of genetic engineering:

"Made with techniques that alter the molecular or cell biology of an organism by means that are not possible under natural conditions or processes. Genetic engineering includes recombinant DNA, cell fusion, micro- and macro-encapsulation, and the following results when achieved by recombinant techniques: gene deletion and doubling, introducing a foreign gene, and changing the positions of genes. It shall not include traditional breeding, conjugation, fermentation, hybridization, in-vitro fertilization, or tissue culture."

Genetic Engineering Considerations in The Evaluation of Inputs for Organic Farming and Food Processing, Report of Policy in Development

Decision Trees for Evaluating Inputs in Crops, Livestock, and Processing