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Why De Minimis?, Matthew D. Adler

All Faculty Scholarship

De minimis cutoffs are a familiar feature of risk regulation. This includes the quantitative “individual risk” thresholds for fatality risks employed in many contexts by EPA, FDA, and other agencies, such as the 1-in-1 million lifetime cancer risk cutoff; extreme event cutoffs for addressing natural hazards, such as the 100-year-flood or 475-year-earthquake; de minimis failure probabilities for built structures; the exclusion of low-probability causal models; and other policymaking criteria. All these tests have a common structure, as I show in the Article. A de minimis test, broadly defined, tells the decisionmaker to determine whether the probability of some outcome is …