An Aggregation Theory of Character Evidence
Hillel J. Bavli
The Journal of Legal Studies, 2022, vol. 51, issue 1, 39 - 62
Courts frequently depart from Federal Rule of Evidence 404, which prohibits evidence of a person’s prior acts to prove that the person acted according to a certain character. This leads to verdicts that are unpredictable and based on behavior not at issue in a case. I develop a theory of aggregation evidence, a new concept that draws on principles of estimation and data aggregation in statistics and ties together evidence from a broad range of contexts. I apply this theory to analyze the effects of character evidence on accuracy and to understand why and when courts depart from the rule against character evidence. I show that a type of character evidence that I call objective-chance evidence stands apart from other forms of character evidence in its ability to improve accuracy. I then argue that a formal exception for this type of evidence may lead to a more coherent rule.
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