As proposed by the Environmental Protection Agency (November 23, 1994), plant-pesticides are all substances responsible for pest resistance in plants, as well as the genes needed for production of these substances. EPA has further proposed that plant-pesticide traits introduced into plants using recombinant DNA techniques should be registered under legal requirements of FIFRA and FFDCA. Exempt from tolerance requirements would be those defence substances and genes evolved naturally or transferred to the plant by traditional plant breeding methods.