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Using Burdens Of Proof To Allocate The Risk Of Error When Assessing Developmental Maturity Of Youthful Offenders, David L. Faigman, Kelsey Geiser

William & Mary Law Review

Behavioral and neuroscientific research provides a relatively clear window into the timing of developmental maturity from adolescence to early adulthood. We know with considerable confidence that, on average, sixteen-year-olds are less developmentally mature than nineteen-year-olds, who are less developmentally mature than twenty-three-year-olds, who are less developmentally mature than twenty-six-year-olds. However, in the context of a given case, the question presented might be whether a particular seventeen-year-old defendant convicted of murder is “developmentally mature enough” that a sentence of life without parole can be constitutionally imposed on him or her. While developmental maturity can be accurately measured in group data, it …