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The EPA is currently conducting RPAR reviews on two widely used rodenticides, strychnine and Compound 1080. In addition, Registration Standards have been developed for the rodenticides warfarin and Fumarin®. The Zinc Phosphide Standard is currently under development. The author briefly explains the factors the Agency has been taking into account in reaching final resolution on these chemicals as well as outlining EPA's re-registration and RPAR programs.