Baze v. Rees

The plurality opinion was written by Chief Justice John Roberts and joined by Justices Anthony Kennedy and Samuel Alito, held that Kentucky's execution method was humane and constitutional. In response to the petitioners' argument that the risk of mistakes in the execution protocol was so great as to render it unconstitutional, the plurality wrote that "an isolated mishap alone does not violate the Eighth Amendment". It also stated that the first drug in a multi-drug cocktail must render the inmate unconscious. Otherwise, there is a "substantial, constitutionally unacceptable risk" that the inmate will suffer a painful suffocation.[5]

Justice John Paul Stevens concurred in the opinion of the Court, writing separately to explain his concerns with the death penalty in general.[6][7] He wrote that the case questioned the "justification for the death penalty itself". He characterized the motivation behind the death penalty as an antithesis to modern values:

We are left, then, with retribution as the primary rationale for imposing the death penalty. And indeed, it is the retribution rationale that animates much of the remaining enthusiasm for the death penalty. As Lord Justice Denning argued in 1950, " 'some crimes are so outrageous that society insists on adequate punishment, because the wrong-doer deserves it, irrespective of whether it is a deterrent or not.' " See Gregg, 428 U. S., at 184, n. 30. Our Eighth Amendment jurisprudence has narrowed the class of offenders eligible for the death penalty to include only those who have committed outrageous crimes defined by specific aggravating factors. It is the cruel treatment of victims that provides the most persuasive arguments for prosecutors seeking the death penalty. A natural response to such heinous crimes is a thirst for vengeance.

He further stressed concern over the process of death penalty cases where emotion plays a major role and where the safeguards for defendants may have been lowered. He cited statistics that indicated that many people sentenced to die were later found to be wrongly convicted. He concluded by stating that a penalty "with such negligible returns to the State [is] patently excessive and cruel and unusual punishment violative of the Eighth Amendment".

None of the other eight members of the Court choose to join Justice Stevens's opinion.

Justice Scalia, joined by Justice Thomas, wrote separately "to provide what I think is needed response to Justice Stevens' separate opinion":[8]

In the fact of Justice Stevens' experience, the experience of all others is, it appears, of little consequence. The experience of the state legislatures and the Congress—who retain the death penalty as a form of punishment—is dismissed as "the product of habit and inattention rather than an acceptable deliberative process". The experience of social scientists whose studies indicate that the death penalty deters crime is relegated to a footnote. The experience of fellow citizens who support the death penalty is described, with only the most thinly veiled condemnation, as stemming from a "thirst for vengeance". It is Justice Stevens' experience that reigns over all.

Justice Stevens' final refuge in his cost-benefit analysis is a familiar one: There is a risk that an innocent person might be convicted and sentenced to death—though not a risk that Justice Stevens can quantify, because he lacks a single example of a person executed for a crime he did not commit in the current American system.

But of all Justice Stevens' criticisms of the death penalty, the hardest to take is his bemoaning of "the enormous costs that death penalty litigation imposes on society," including the "burden on the courts and the lack of finality for victim's families." Those costs, those burdens, and that lack of finality are in large measure the creation of Justice Stevens and other Justices opposed to the death penalty, who have "encumber[ed] [it] … with unwarranted restrictions neither contained in the text of the Constitution nor reflected in two centuries of practice under it"—the product of their policy views "not shared by the vast majority of the American people.