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The US Supreme Court on Tuesday struck down Florida鈥檚 method for determining whether a death-row inmate has an intellectual disability significant enough to bar imposition of the death penalty.

The justices said Florida鈥檚 approach violated the Eighth Amendment ban on cruel and unusual punishment by creating an unacceptable risk that an intellectually disabled inmate would be executed.

In a 5-to-4 decision, the high court effectively set a national standard that will require Florida and eight other states to revise their procedures for deciding whether capital punishment may be imposed on a convicted criminal with a low IQ.

The Florida Supreme Court had established a bright-line rule that those scoring 70 or below on an IQ test were not eligible for capital punishment.聽The key question in the Florida case was whether a death row inmate with an IQ score of 71 could be executed.

In declaring the Florida rule unconstitutional, Justice Anthony Kennedy said the state鈥檚 bright-line approach was in direct opposition to the views of mental health experts who favor a more elastic reading of IQ test results.聽He said Florida鈥檚 criterion was too rigid and did not account for a possible margin of error.

鈥淚ntellectual disability is a condition, not a number,鈥� Justice Kennedy said.

In a dissent, Justice Samuel Alito said the majority justices had shifted the court鈥檚 capital punishment jurisprudence by placing heavy reliance on consensus among medical experts.

Justice Alito said the high court鈥檚 prior capital punishment decisions had been based on an assessment of the evolving standards of American society as a whole 鈥� including judgments made by state lawmakers.

鈥淣ow, however, the Court strikes down a state law based on the evolving standards of professional societies, most notably the American Psychiatric Association,鈥� Alito said.

Tuesday鈥檚 decision invalidates the capital sentence of Florida death-row inmate Freddie Lee Hall, whose lawyers argued that their client was too mentally disabled to face execution.

鈥淔reddie Lee Hall may or may not be intellectually disabled, but the law requires that he have the opportunity to present evidence of his intellectual disability, including deficits in adaptive functioning over his lifetime,鈥� Kennedy said in a 22-page opinion.

Under the Florida approach, any assessment of Mr. Hall鈥檚 intellectual disability stopped if he tested above a 70 IQ.

The court鈥檚 decision now requires that states take into account the margin of error in any IQ calculation and provide an inmate an opportunity to demonstrate to a judge a second factor 鈥� the subject鈥檚 ability to adapt to the requirements of daily life.

That second inquiry involves an examination of the inmate鈥檚 adaptive abilities from an early age. It must include assessments of the individual鈥檚 environment and upbringing.

鈥淭he death penalty is the gravest sentence our society may impose,鈥� Kennedy wrote. 鈥淧ersons facing that most severe sanction must have a fair opportunity to show that the Constitution prohibits their execution.鈥�

The decision is a refinement of a 2002 landmark decision in which the Supreme Court declared that the Eighth Amendment鈥檚 prohibition on cruel and unusual punishment barred the imposition of lethal punishment for anyone identified as 鈥渕entally retarded.鈥�

But the majority justices in that decision left it to each state individually to decide how best to determine whether a particular condemned inmate was ineligible for a death sentence because of intellectual disability.

Relying on that 2002 decision, the Florida Supreme Court endorsed a bright-line cutoff that allowed the execution of any inmate with a tested IQ higher than 70.

鈥淔lorida seeks to execute a man because he scored a 71 instead of 70 on an IQ test,鈥� Kennedy wrote. 鈥淔lorida is just one of a few states that have this rigid rule.鈥�

Kennedy said the Florida approach is in 鈥渄irect opposition to the views of those who design, administer, and interpret the IQ test.鈥�

The justice added: 鈥淏y failing to take into account the standard error of measurement, Florida鈥檚 law not only contradicts the test鈥檚 own design but also bars an essential part of a sentencing court鈥檚 inquiry into adaptive functioning.鈥�

In his dissent, Justice Alito said he would defer to the judgment of the states on how best to assess whether a condemned inmate was mentally disabled.

鈥淭he resolution of this case should be straightforward: Just as there was no methodological consensus among the States at the time of the [2002 landmark decision], there is no such consensus today,鈥� Alito said.聽鈥淎nd in the absence of such a consensus, we have no basis for holding that Florida鈥檚 method contravenes our society鈥檚 standards of decency.鈥澛�

Alito鈥檚 dissent was joined by Chief Justice John Roberts and Justices Antonin Scalia and Clarence Thomas.

Kennedy鈥檚 majority opinion was joined by Justices Ruth Bader Ginsburg, Stephen Breyer, Sonia Sotomayor, and Elena Kagan.

The decision stems from a legal challenge to Florida鈥檚 death penalty system mounted by lawyers representing Mr. Hall.

Hall has been on death row since he was convicted for his role in the 1978 kidnap, sexual assault, and murder of a 21-year-old housewife, Karol Hurst.聽Mrs. Hurst was abducted while loading groceries into her car in a food store parking lot in Leesburg, Fla.

Hall and another man targeted her because they wanted to use her car to rob a convenience store. Rather than simply stealing the car, Hall forced Hurst into the car and drove her to a wooded area. The other man followed in his car.

Hurst, who was seven months pregnant, was sexually assaulted and shot dead.

Later that day, the two men drove Hurst鈥檚 car 鈥� with groceries still in the back seat 鈥� to a convenience store. The store manager became suspicious and called police. A sheriff鈥檚 deputy arrived and was shot dead after confronting Hall and the other man outside the store.

There is no claim of innocence. The only issue was whether Hall鈥檚 execution was barred under the Eighth Amendment because Florida did not follow a particular procedure to determine whether Hall is intellectually disabled.

From 1968 to 2008, Hall took nine different IQ tests. The results range from a high score of 80 in 1986 to a low score of 60 in 1988, according to court documents. The average score from all nine tests is 72.66.

In the most recent test in 2008, Hall showed an IQ of 72.聽

The case was Hall v. Florida (12-10882).