United States v. Tsarnaev
The Supreme Court reinstated Dzhokhar Tsarnaev's death sentences for the 2013 Boston Marathon bombings, ruling that the trial judge made no reversible errors — neither in his careful but selective jury questioning nor in blocking unreliable evidence about his brother's alleged prior murders.
The decision reaffirms that trial judges in high-profile death penalty cases keep wide discretion to control jury selection and exclude confusing evidence, and it limits the power of federal appeals courts to impose their own procedural rules on trial courts.
“Dzhokhar Tsarnaev committed heinous crimes. The Sixth Amendment nonetheless guaranteed him a fair trial before an impartial jury. He received one.”
The majority's closing statement after finding no reversible error in the trial judge's conduct.
How it got here: The district court convicted Tsarnaev and sentenced him to death; the First Circuit vacated the capital sentences on two grounds; the Government sought Supreme Court review and the Court agreed to hear the case.
The Case in Depth
What happened
Dzhokhar Tsarnaev and his brother Tamerlan planted pressure-cooker bombs at the 2013 Boston Marathon finish line, killing three people and wounding hundreds. In the days that followed, they murdered an MIT campus police officer and engaged in a street battle with police. Dzhokhar was convicted of 30 federal crimes. At sentencing he argued his older brother Tamerlan was the violent ringleader who pressured him into the attack, and sought to introduce evidence of a brutal triple murder Tamerlan had allegedly committed years earlier.
The question before the Court
Did the trial judge make serious enough errors in the Boston Marathon bomber's capital trial — in how he questioned potential jurors about news coverage and what sentencing evidence he allowed — to justify throwing out the death sentences?
The Court's answer
No — the appeals court was wrong to throw out the death sentences on either ground.
On jury selection: the trial judge acted well within his broad discretion when he declined to ask each potential juror a sweeping question about exactly what news they had seen. His overall process — a 100-question written form, three weeks of individualized questioning, and firm instructions to decide only on courtroom evidence — was thorough and reasonable. The First Circuit had no authority to override that by invoking its own "supervisory power" to mandate a specific question; appeals courts cannot use supervisory rules to circumvent legal standards the Supreme Court has already set. On sentencing evidence: the trial judge also acted reasonably when he excluded evidence tying Tamerlan to an unsolved triple murder. Because every witness who might have explained what actually happened was dead, the evidence could not reliably show Tamerlan's role — and admitting it risked a confusing side-trial that shed little light on Dzhokhar's own culpability. The Federal Death Penalty Act's balancing test, which allows courts to exclude evidence when confusion outweighs probative value, does not violate the Constitution.
Curious how the Court got there? See the step-by-step legal reasoning →
Why it matters
Capital defendants seeking a new sentencing hearing will face a high bar: trial judges retain broad authority to exclude unreliable or jury-confusing mitigation evidence even in death cases, and appeals courts cannot manufacture mandatory voir-dire rules to override that discretion. For Tsarnaev specifically, the original death sentences stand and the case returns to the district court for execution proceedings.
What changes now
With the First Circuit's vacatur reversed, Tsarnaev's original death sentences are reinstated and the case returns to the district court. This is a final merits decision; there is no remand for further proceedings on the sentencing questions resolved here. Tsarnaev will remain on federal death row, subject to the ordinary process governing federal executions.
What this does not decide
The Court did not decide whether courts of appeals have any supervisory authority over district courts at all — the government conceded that power existed, so the question was left open (Justice Barrett's concurrence urges a future reexamination). The Court also did not revisit whether the Lockett/Eddings Eighth Amendment precedents were correctly decided.
Concurrences and dissents
Concurrence — Justice Barrett
Justice Barrett agreed that the First Circuit erred — because its mandatory media-content rule conflicted with Supreme Court precedents giving trial judges broad voir-dire discretion — but wrote separately to raise deeper doubts about whether courts of appeals have supervisory authority over district courts at all. Article III makes this Court 'supreme' over inferior courts, possibly grounding this Court's own supervisory power; but no comparable constitutional text supports the same authority for courts of appeals, and no statute grants it either. Barrett called for the Court to reexamine the question in a future case.
Dissent — Justice Breyer
“The extra time that close examination takes is part of the procedural price that a judicial system allowing the death penalty will inevitably exact.”Breyer explaining why particularly careful appellate review is appropriate in capital cases.
Justice Breyer, joined fully by Justice Kagan and by Justice Sotomayor except as to Part II-C, argued that the district court abused its discretion by excluding the Waltham murders evidence. That evidence was probative, corroborated by multiple sources, and critically important to Tsarnaev's only real defense — that his brother's violent influence drove the bombings. Death penalty proceedings are constitutionally special and warrant closer judicial scrutiny of evidentiary exclusions. The exclusion was not harmless: only one juror's change of mind would have blocked the death penalty, and the jury's own nuanced verdict showed close attention to the brothers' relative roles. Part II-C, not joined by Sotomayor, recounts Breyer's broader concerns about the death penalty system generally.
How the Court got there
The legal reasoning, step by step
- The Sixth Amendment guarantees an impartial jury — but impartial does not mean ignorant of a famous case. Trial judges have broad discretion to decide what questions to ask potential jurors, and appeals courts can reverse that choice only when it was an abuse of discretion, meaning clearly unreasonable. That deferential standard does not disappear just because a case attracted heavy news coverage; if anything, it matters more, because the trial judge sits in the community and can best gauge local media impact.
- The district court's decision to skip a blanket 'list everything you read about this case' question was reasonable on its face: the judge explained it would produce unmanageable data and would focus attention on what jurors already knew rather than on whether they could be fair. The actual process — screening 1,373 potential jurors with a detailed written questionnaire, three weeks of in-person probing for bias, and repeated instructions to decide only on trial evidence — was thorough and plainly consistent with Supreme Court precedents on voir dire.
- The First Circuit tried to justify its reversal by invoking its own 1968 'supervisory authority' rule (from Patriarca v. United States) that required asking about the content and extent of each juror's media exposure. But under United States v. Payner (1980), appeals courts cannot use supervisory power to create procedural rules that override or go around legal standards the Supreme Court has already established. Because the Supreme Court had long held that trial courts have broad voir-dire discretion, the First Circuit's mandatory media-content rule simply wasn't permissible — it substituted the appeals court's preferred practice for the district court's sound judgment.
- On the sentencing evidence, the Federal Death Penalty Act allows defendants to present almost any mitigating information — even material normally inadmissible at trial — but gives the district court discretion to exclude it when its probative value is outweighed by the risk of confusing the jury. That exclusion is reviewed for abuse of discretion: an appellate court must defer to the trial court's judgment unless the decision was 'manifestly erroneous.'
- The district court's decision to bar evidence about the Waltham murders was not manifestly erroneous. Every person who could have shed light on Tamerlan's actual role was dead: Tamerlan was killed during the police chase, and Todashev (the only witness) was killed by FBI agents during the interview. The available evidence could not establish whether Tamerlan was the leader or a minor participant, making it equally plausible — as the trial judge put it — that Todashev was 'the bad guy.' Admitting the evidence would have required a confusing mini-trial with no living witnesses and little payoff in clarifying Tamerlan's influence over Dzhokhar.
- The Eighth Amendment argument — that excluding any marginally relevant mitigating evidence is unconstitutional — was also rejected. The Lockett line of cases only prohibits governments from categorically cutting off an entire type of mitigation evidence; they do not prevent courts from applying a case-by-case balancing test to specific pieces of evidence. Section 3593(c) is a highly permissive regime that preserves the defendant's ability to present relevant mitigation while still allowing judges to exclude genuinely unreliable or confusing material.
Doctrinal impact
Cases affected by this decision
Reaffirms United States v. Payner (447 U.S. 727)
Courts of appeals cannot invoke supervisory power to override legal standards the Supreme Court has already established.
Reaffirms Mu'Min v. Virginia (500 U.S. 415)
Trial courts have wide discretion in voir dire, including deciding what questions to ask potential jurors.
Distinguishes Lockett v. Ohio (438 U.S. 586)
Lockett bars categorical exclusion of mitigating evidence, but does not prevent case-by-case balancing tests that exclude specific unreliable items.