摘要:Endocrine-disrupting chemicals have permeated global ecosystems, crossing international boundaries to contaminate people far from ini tial sources of production and consumption. Not only do toxic resi dues complicate political boundaries, they also confuse temporal distinctions, for their legacies persist long after they have been banned. Moreover, the risks of exposure to these chemicals are rarely equitably distributed in a human population. This article examines chemical exposures in four indigenous communities in the United States and Canada, arguing that quantitative risk assessment proto cols have failed to protect these communities from harm.