Page:Glossip v. Gross.pdf/7

 Cite as: 576 U. S. ____ (2015)

3

Opinion of the Court

Nevertheless, hanging and the firing squad were retained in some States, see, e.g., 1961 Del. Laws ch. 309, §2 (hanging); 1935 Kan. Sess. Laws ch. 155, §1 (hanging); Utah Code Crim. Proc. §105–37–16 (1933) (hanging or firing squad), and electrocution remained the predominant method of execution until the 9-year hiatus in executions that ended with our judgment in Gregg v. Georgia, 428 U. S. 153 (1976). See Baze, supra, at 42. After Gregg reaffirmed that the death penalty does not violate the Constitution, some States once again sought a more humane way to carry out death sentences. They eventually adopted lethal injection, which today is “by far the most prevalent method of execution in the United States.” Baze, supra, at 42. Oklahoma adopted lethal injection in 1977, see 1977 Okla. Sess. Laws p. 89, and it eventually settled on a protocol that called for the use of three drugs: (1) sodium thiopental, “a fast-acting barbiturate sedative that induces a deep, comalike unconsciousness when given in the amounts used for lethal injection,” (2) a paralytic agent, which “inhibits all muscular-skeletal movements and, by paralyzing the diaphragm, stops respiration,” and (3) potassium chloride, which “interferes with the electrical signals that stimulate the contractions of the heart, inducing cardiac arrest.” Baze, supra, at 44; see also Brief for Respondents 9. By 2008, at least 30 of the 36 States that used lethal injection employed that particular three-drug protocol. 553 U. S., at 44. While methods of execution have changed over the years, “[t]his Court has never invalidated a State’s chosen procedure for carrying out a sentence of death as the infliction of cruel and unusual punishment.” Id., at 48. In Wilkerson v. Utah, 99 U. S. 130, 134–135 (1879), the Court upheld a sentence of death by firing squad. In In re Kemmler, supra, at 447–449, the Court rejected a challenge to the use of the electric chair. And the Court did not retreat from that holding even when presented with a