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GLOSSIP v. GROSS Opinion of the Court

The Eighth Amendment, made applicable to the States through the Fourteenth Amendment, prohibits the infliction of “cruel and unusual punishments.” The controlling opinion in Baze outlined what a prisoner must establish to succeed on an Eighth Amendment method-of-execution claim. Baze involved a challenge by Kentucky death row inmates to that State’s three-drug lethal injection protocol of sodium thiopental, pancuronium bromide, and potassium chloride. The inmates conceded that the protocol, if properly administered, would result in a humane and constitutional execution because sodium thiopental would render an inmate oblivious to any pain caused by the second and third drugs. 553 U. S., at 49. But they argued that there was an unacceptable risk that sodium thiopental would not be properly administered. Ibid. The inmates also maintained that a significant risk of harm could be eliminated if Kentucky adopted a one-drug protocol and additional monitoring by trained personnel. Id., at 51. The controlling opinion in Baze first concluded that prisoners cannot successfully challenge a method of execution unless they establish that the method presents a risk that is “ ‘sure or very likely to cause serious illness and needless suffering,’ and give rise to ‘sufficiently imminent dangers.’ ” Id., at 50 (quoting Helling v. McKinney, 509 U. S. 25, 33, 34–35 (1993)). To prevail on such a claim, “there must be a ‘substantial risk of serious harm,’ an ‘objectively intolerable risk of harm’ that prevents prison officials from pleading that they were ‘subjectively blameless for purposes of the Eighth Amendment.’ ” 553 U. S., at 50 (quoting Farmer v. Brennan, 511 U. S. 825, 846, and n. 9 (1994)). The controlling opinion also stated that prisoners “cannot successfully challenge a State’s method of execution merely by showing a slightly or marginally safer alternative.” 553 U. S., at 51. Instead, prisoners must identify an alternative that is “feasible, readily