Whether a prospective capital juror may be excluded for cause only when the juror makes it unmistakably clear that she would automatically vote against the death penalty or cannot impartially decide guilt.
Holding
No. A prospective juror may be excluded when the juror's views on capital punishment would prevent or substantially impair performance of her duties in accordance with the court's instructions and her oath.
Reasoning
The Court treated Adams v. Texas, rather than the rigid phrasing of Witherspoon's footnote 21, as the governing rule. The constitutional question is whether the juror can conscientiously find facts and apply the governing law, not whether the juror uses particular words or states an absolute refusal ever to impose death.
Witherspoon arose under an older Illinois system in which the jury had broad, unguided sentencing discretion. Modern capital-sentencing schemes commonly require jurors to answer statutory questions or apply structured legal standards. A juror who might theoretically consider death but refuses or is unable to follow those legal instructions may properly be removed for cause.
The Court characterized the references in Witherspoon to jurors who would automatically vote against death and who made their views unmistakably clear as dicta rather than a controlling verbal formula. Those phrases could not sensibly require the seating of jurors whose views would make them unable to perform their sworn duties.
A capital defendant has a right to an impartial jury, but that right does not entitle the defendant to retain jurors who are likely biased in the defendant's favor because of their opposition to capital punishment. The State may seek jurors who can decide facts impartially and apply the law conscientiously.
The Court also rejected a requirement that bias be shown with unmistakable clarity. Voir dire is not a catechism: some prospective jurors cannot articulate their views precisely, may be uncertain how they will react, or may conceal their true beliefs. A trial judge may properly assess the entire exchange, including a juror's demeanor and credibility.