Since 1988 courts in Alabama, Louisiana and Indiana have ruled that such an execution would violate the Thompson ruling. It is conceivable, however, that a state could introduce legislation specifying a minimum age of less than 16 for capital defendants. If that state's appeals courts subsequently upheld a death sentence imposed on a juvenile offender who was under 16 at the time of the crime, the question of whether it is constitutional to execute such an offender could once again come before the US Supreme Court. In 1996 the International Commission of Jurists reported on the US death penalty. Instead they must look to global standards, as articulated by international human rights instruments.
Human rights have no borders.
Its cruelty against anyone is undeniable. The latter case was Wilkins v Missouri xxiii International Commission of Jurists. Administration of the Death Penalty in the United States.