Double Jeopardy: Constitutional Protection Against Repeated Prosecution

One Trial, One Verdict — A Fundamental Promise

The principle seems simple: the government gets one shot. If it tries someone for a crime and loses, it cannot try again. If a conviction is entered and punishment imposed, the case is closed. This protection — encoded in the Fifth Amendment's Double Jeopardy Clause — has roots stretching to Roman law and English common law. But the simple promise conceals a doctrine of considerable complexity. Exceptions, technical rules about when jeopardy "attaches," and the doctrine of dual sovereignty mean that double jeopardy provides less protection than many people assume.

Text and Constitutional Roots

The Fifth Amendment states that no person shall "be subject for the same offence to be twice put in jeopardy of life or limb." The phrase "life or limb" is archaic — it originally referred to the most severe punishments, but courts have applied the clause to all criminal prosecutions. The protection was incorporated against the states through the Fourteenth Amendment in Benton v. Maryland (1969), making it binding on state prosecutions as well.

The clause protects three distinct interests: protection against a second prosecution after acquittal for the same offense; protection against a second prosecution after conviction for the same offense; and protection against multiple punishments for the same offense in a single prosecution.

When Does Jeopardy Attach?

Constitutional protection does not begin the moment a person is charged. It attaches at a specific procedural moment that varies by the type of proceeding. Before jeopardy attaches, the government may drop charges and refile without constitutional restriction.

Before those moments, no double jeopardy bar exists. Charges dismissed before trial, indictments returned and then withdrawn, and cases dismissed on procedural grounds before the relevant moment all leave the government free to refile. This is why prosecutors sometimes dismiss and refile charges without double jeopardy consequences — the bar had not yet attached.

The Same Offense Test: Blockburger

For double jeopardy to apply, the second prosecution must be for the "same offense" as the first. The Supreme Court established the governing test in Blockburger v. United States (1932): two offenses are the same for double jeopardy purposes unless each requires proof of at least one fact that the other does not. If one crime has an element the other lacks, they are different offenses — and successive prosecution is constitutional.

The Blockburger test allows prosecution for crimes that closely overlap. A defendant acquitted of first-degree murder may be tried for second-degree murder if the second charge requires proof of an element absent from the first, though this specific scenario raises additional complications. Charges for robbery and theft arising from the same incident may both proceed if each requires proof of a distinct element.

• Lesser included offenses: A lesser included offense is one that is necessarily established by proof of the greater offense. Conviction or acquittal of the greater offense bars separate prosecution for the lesser, and vice versa.
• Collateral estoppel: Recognized in Ashe v. Swenson (1970), this doctrine bars the government from relitigating a factual issue decided in the defendant's favor at a prior trial — even if the second charge is technically a different offense.

Mistrials and the Re-Trial Question

A mistrial — the judge declaring the trial void and discharging the jury before verdict — raises complex double jeopardy questions. The general rule: when a mistrial is declared over the defendant's objection, retrial is barred unless there was manifest necessity for the mistrial. Courts have found manifest necessity when jurors become deadlocked (a hung jury), when a juror commits misconduct, or when the defendant becomes seriously ill during trial.

When the defendant requests or consents to a mistrial, double jeopardy generally does not bar retrial. The exception is prosecutorial misconduct — if a prosecutor intentionally goads the defendant into moving for a mistrial to get a second chance at a better-prepared case, retrial is barred. This principle was established in Oregon v. Kennedy (1982).

The Dual Sovereignty Exception

The most practically significant limitation on double jeopardy protection is the dual sovereignty doctrine. Under this rule, two separate sovereigns — the federal government and a state, or two different states — may each prosecute a defendant for the same conduct without violating double jeopardy. Each sovereign has its own laws and courts; a prosecution by one does not bar prosecution by another.

The doctrine has produced controversial outcomes. After the 1992 state court acquittals of Los Angeles police officers in the beating of Rodney King, the federal government brought civil rights charges under 18 U.S.C. § 242. Four officers were retried in federal court; two were convicted and sentenced to 30 months in prison. The dual sovereignty doctrine has also enabled the federal government to prosecute individuals acquitted of state murder charges when federal interests — such as civil rights violations — are implicated.

Civil Proceedings and Double Jeopardy

Double jeopardy applies only to criminal prosecutions. A criminal acquittal does not bar a subsequent civil lawsuit arising from the same conduct. O.J. Simpson's 1995 criminal acquittal for murder did not prevent his family members from pursuing a civil wrongful death lawsuit, which resulted in a $33.5 million judgment against him in 1997. Civil proceedings operate under the lower preponderance-of-the-evidence standard and are entirely outside the scope of the Fifth Amendment's double jeopardy protection.

Protections That Actually Hold

Despite its exceptions, double jeopardy provides real and essential protection. A jury acquittal — no matter how inexplicable, no matter how much evidence the government believes it had — is final. The government cannot appeal an acquittal. It cannot retry a defendant after the jury says not guilty. This finality, even when it produces outcomes prosecutors find unjust, preserves the integrity of the jury's constitutional role as the ultimate check on government power. This article is for informational purposes only and does not constitute legal advice.