Prospects for Developmental Evidence in Juvenile Sentencing Based on Miller v. Alabama

Recent U.S. Supreme Court decisions barred mandatory life without parole for juvenile homicide (Miller v. Alabama, 2012) and applied Miller retroactively (Montgomery v. Louisiana, 2016). Miller identified several developmental factors to consider in mitigation, but left many questions unanswered about their application. The authors offer several sentencing contexts to frame the types of developmental and clinical evidence that may be relevant for Miller hearings under various circumstances. Within these contexts, they explore types and sources of relevant developmental evidence and raise questions about quality and limitations. Their analysis identifies areas in which appellate court clarification is needed to determine how developmental evidence will be used in Miller cases, and they alert developmental experts to prospects and cautions for providing relevant evidence, as well as areas in need of research.