In a series of Eighth Amendment cases referred to as theMillertrilogy, the Supreme Court significantly limited the extent to which minors may be exposed to extreme sentences. Specifically, in this line of cases the Court abolished capital punishment for minors and narrowed the instances when minors may be sentenced to life without parole. Only minors convicted of homicide who are found to be “in-corrigible” may now be subject to a death-in-custody sentence. In limiting extreme sentences for youth in these ways, the Supreme Court relied upon the social and medical science that demonstrates youth are simultaneously less culpable for their acts and more amenable to rehabilitation than adults.

中文翻译：

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米勒三部曲与极端少年刑罚的持久性

在一系列被称为米勒三部曲的第八修正案案件中，最高法院极大地限制了未成年人可能面临极端刑罚的程度。具体而言，在这一系列案件中，法院废除了对未成年人的死刑，缩小了未成年人可能被判处终身不得假释的情况。只有被判犯有“不可救药”罪的未成年人现在可能会被判处死刑。在以这些方式限制对青少年的极端刑罚时，最高法院依靠社会和医学科学证明，与成年人相比，青少年同时对其行为的责任更小，更易于康复。