Robin Manning, who received a mandatory sentence of life without parole for a crime committed shortly after his eighteenth birthday, contested the constitutionality of the sentence. The Michigan Supreme Court, however, declined to grant review of his case. Arguments presented in amicus briefs asserted that imposing a sentence of life without the possibility of parole on an individual aged eighteen represents a violation of the Eighth Amendment's prohibition against cruel and unusual punishment. This argument rests upon the assertion that young adults possess distinctive developmental characteristics that warrant consideration.

Robin Manning, who received a mandatory life sentence without the possibility of parole for a crime committed shortly after his 18th birthday, contested the sentence's constitutionality. However, the Michigan Supreme Court declined to hear his case. Supporting briefs, known as amicus briefs, argued that sentencing an 18-year-old to life in prison without parole constitutes cruel and unusual punishment, violating the Eighth Amendment, due to the distinct developmental characteristics of individuals in this age group.

Robin Manning, who was given a life sentence without the possibility of parole for a crime he committed just three months after turning 18, recently had his case dismissed by the Michigan Supreme Court. Manning believes that this sentence is unconstitutional. Several "friend of the court" briefs were filed in support of Manning, claiming that sentencing an 18-year-old to life in prison with no chance of release is a cruel and unusual punishment, which would violate the Eighth Amendment, especially since young adults are still developing and maturing.

Robin Manning, who was given a life sentence in prison for a crime he committed when he was 18 years old, recently asked the Michigan Supreme Court to reconsider his sentence. He believes it's unfair, because of his young age. The court decided not to review his case. Some people wrote to the court arguing that giving an 18-year-old a life sentence without the possibility of parole is too harsh a punishment, especially because young adults are still growing and changing. They believe this type of sentence is against the part of the Constitution that protects people from cruel and unusual punishment.