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Exactly two years after the US Supreme Court ruled against mandatory life without parole sentences for juveniles convicted of murder, the majority of states affected by the ruling have not passed laws banning the practice, according to a report by the Sentencing Project. Ad Policy

The Supreme Court ruled five-to-four in Miller v. Arizona that mandatory life without parole (LWOP) sentences for minors violate the Eighth Amendment ban on cruel and unusual punishment. In her majority opinion, Justice Kagan cited research that found that “only a relatively small proportion of adolescents who experiment in risky or illegal activities develop entrenched patterns of problem behavior that persist into adulthood.”

Only thirteen of twenty-eight states that had locked up minors for life without a chance for release have passed laws to comply with the Court’s decision. Several of the states that amended their sentencing laws, however, set lengthy requirements that some juvenile advocates are still calling inhumane. For example, both Texas and Nebraska set new minimum sentences of forty years, practically guaranteeing that some juvenile offenders will spend the majority of their lives behind bars.

“It appears that many states are disregarding the spirit of the Court’s ruling. Of the states that have passed legislative responses to Miller, many replaced their laws with sentences that are as nearly as narrow-minded,” said Ashley Nellis, a senior analyst at the Sentencing Project, in a statement.

The Miller decision did not determine whether the estimated 2,000 prisoners already serving mandatory LWOP sentences would be eligible for re-sentencing. Ten of the twenty-eight affected states have addressed this issue, passing laws or issuing court decisions that apply Miller retroactively.

The Sentencing Project's report notes that states do not necessarily have to pass new legislation to comply with Miller, but

States’ practices of sending children to die in prison puts the United States at odds with international standards. In fact, ours is the only nation in the world that sends minors to die in prison, and is one of few that refuses to sign the United Nations Convention on the Rights of the Child, which bans the practice.

(CORRECTION, 6/26/2014): An earlier version of this post suggested that states must pass legislation to comply with Miller. In fact, some states have ended mandatory life without parole for juveniles through litigation. The headline and first paragraph of this post have been updated for clarification.