Double Jeopardy Explained: When You Can (and Cannot) Be Tried Twice

Last updated: 12 November 2026. This explainer uses the US Constitution, Supreme Court opinions including Gamble v. United States, New York’s Criminal Procedure Law, the Justice Manual, the Criminal Justice Act 2003 and the Court of Appeal’s 2011 Dobson judgment, plus court reporting on the Luigi Mangione cases up to early November 2026.

Short answer: Double jeopardy stops the same government from trying you again for the same offence after an acquittal or conviction, or punishing you twice for it. It does not stop a retrial after a hung jury or a successful appeal, a civil lawsuit, or a second prosecution by a different sovereign, so a state and the federal government can each charge the same conduct.

Key takeaways

• The Fifth Amendment protects against a second prosecution after acquittal, a second prosecution after conviction, and multiple punishments for the same offence.
• Jeopardy usually attaches when the jury is sworn, when the first witness is sworn in a bench trial, or when a court accepts a guilty plea.
• Under the dual sovereignty doctrine, reaffirmed 7 to 2 in Gamble v. United States (2019), state and federal prosecutions for the same act are allowed.
• New York’s own statute goes further than the Constitution, which is why Luigi Mangione’s August 2026 federal guilty plea has put his state murder case on hold.

What is double jeopardy?

Double jeopardy is the rule that the state cannot keep prosecuting a person for the same crime until it gets the result it wants. In the United States it comes from the Fifth Amendment, which says no person shall “be subject for the same offence to be twice put in jeopardy of life or limb”. The Supreme Court applied the clause to the states in Benton v. Maryland (1969), so it binds every state court as well as federal courts.

The clause gives three separate protections:

• No second prosecution after an acquittal. A not guilty verdict is final, even if the judge or jury got it wrong. The prosecution cannot appeal it.
• No second prosecution after a conviction. Once you are convicted of an offence, the same government cannot charge you with it again to get a longer sentence.
• No multiple punishments for the same offence. A court cannot impose two sentences for what the legislature meant to be one crime.

The protection covers criminal punishment only, which is why someone acquitted of a killing can still be sued for wrongful death. Our guide to civil and criminal cases explains the different burdens of proof.

When does jeopardy attach, and what is the “same offence”?

Double jeopardy only applies once jeopardy has “attached”. Before that point a prosecutor can drop charges and refile them, and a grand jury can be asked to indict again. In a jury trial jeopardy attaches when the jury is empanelled and sworn, which happens at the end of voir dire. In a bench trial it attaches when the first witness is sworn. A guilty plea entered at an arraignment or later counts once the court accepts it.

The second question is whether the two charges are the “same offence”. Federal courts use the Blockburger test, from Blockburger v. United States (1932): two offences are different if each requires proof of a fact that the other does not. That is why one act can lead to several convictions. A shooting can be charged as murder and as illegal possession of a weapon, because each crime has an element the other lacks.

There is a further protection called collateral estoppel. In Ashe v. Swenson (1970) the Supreme Court held that once a jury has decided an issue of fact in the defendant’s favour, such as that he was not one of the robbers, the same government cannot relitigate that issue in a trial over a different victim of the same robbery.

When can you be tried twice for the same crime?

There are several well-established situations where a second trial is allowed. The table sets out the main ones in US federal constitutional law.

Most high-profile “tried twice” cases in the United States fall into the last three rows.

What is the dual sovereignty doctrine?

The dual sovereignty doctrine says an offence against a state and an offence against the United States are two different offences, even when they arise from exactly the same act, because each government defines its own crimes. The Supreme Court confirmed this in 1959 in Bartkus v. Illinois and Abbate v. United States, and in Heath v. Alabama (1985) it applied the same logic to two states prosecuting one killing.

In Gamble v. United States, decided on 17 June 2019, Terance Gamble asked the Court to abolish the doctrine. Police in Mobile, Alabama had found a handgun in his car in 2015. He had a prior robbery conviction, pleaded guilty to the state charge of illegal possession, and was then indicted federally for the same possession under 18 U.S.C. 922(g)(1). Justice Alito, writing for a 7 to 2 majority, refused to overrule the doctrine. He reasoned that the clause protects against being tried twice for the same “offence”, and an offence is defined by a particular sovereign’s law. The Court also held that the historical evidence was too weak to justify departing from precedent, which makes Gamble a useful study in stare decisis. Justices Ginsburg and Gorsuch dissented.

The doctrine has limits. Cities and counties are part of their state, so a state cannot follow a municipal prosecution with its own (Waller v. Florida, 1970). In Puerto Rico v. Sanchez Valle (2016) the Court held that Puerto Rico and the federal government are not separate sovereigns for this purpose, because Puerto Rico’s power to prosecute ultimately comes from Congress.

In practice, the Department of Justice also restrains itself. Its Petite policy (Justice Manual 9-2.031) says federal prosecutors should not bring a case after a state prosecution for substantially the same acts unless there is a substantial federal interest that the earlier case left “demonstrably unvindicated”, the evidence will probably be enough to convict, and an Assistant Attorney General approves it in advance. Many states also have statutes that bar a state prosecution after a federal one in some circumstances.

How does double jeopardy apply to the Luigi Mangione cases?

The prosecutions of Luigi Mangione over the killing of UnitedHealthcare chief executive Brian Thompson in Midtown Manhattan on 4 December 2024 show both halves of the law at work: the federal Constitution allows two cases, but New York’s own statute may not.

• State case. A Manhattan grand jury indicted Mangione in December 2024, including on first-degree murder in furtherance of terrorism. On 16 September 2025 Justice Gregory Carro dismissed the two terrorism-related murder counts as legally insufficient. A second-degree murder count and weapons counts remain. At the same hearing he rejected as premature an earlier defence argument that running state and federal cases in parallel amounted to double jeopardy.
• Federal case. A federal grand jury indicted him in April 2025 on two stalking counts and two firearms counts, one of them death-eligible, and the Attorney General had announced that prosecutors would seek the death penalty. On 30 January 2026 Judge Margaret Garnett dismissed both firearms counts, holding that the stalking offences were not “crimes of violence”, which took the death penalty off the table. Prosecutors told the court on 27 February 2026 that they would not appeal.
• The guilty plea. On 14 August 2026 Mangione pleaded guilty in federal court to the two counts of stalking resulting in death, without a plea agreement. Each count carries up to life in prison, and sentencing is set for 18 December 2026.

Because of Gamble, the Fifth Amendment alone does not stop Manhattan prosecutors from trying him for murder. The fight is under New York law. Criminal Procedure Law section 40.20 says a person “may not be twice prosecuted for the same offense” and may not be separately prosecuted for two offences based on the same act or criminal transaction unless an exception applies. Section 40.30 says a person has been “prosecuted” when a case in a court “of any jurisdiction within the United States” ends in a guilty plea or reaches a sworn jury. A federal plea can therefore count.

Straight after the plea, his lawyers asked Justice Carro to dismiss the state murder and weapons charges. They argue the federal plea ended a “previous prosecution” for the same core conduct, with the same victim and the same gun, and that the two offices coordinated so the state case would be tried first. The Manhattan District Attorney’s office argues the offences are different, relying on the exception for statutes “designed to prevent very different kinds of harm or evil”, and says Mangione was never prosecuted for the federal firearms offences because they were dismissed. On 17 August 2026 Carro postponed the state trial, which had been due to start on 8 September, reported PBS. The next state hearing was set for 10 December 2026, about a week before the federal sentencing. The defence pressed its argument again in a filing reported at the end of October, and ABC7 New York reported that oral argument is expected in December. As of 12 November 2026 there is no ruling, and the judge’s decision can be appealed.

The defence has also raised due process concerns about coordination between prosecutors, which overlaps with the arguments covered in our guide to vindictive and selective prosecution.

Can you be tried twice for the same crime in the UK?

In England and Wales the old rule against retrial after acquittal was relaxed in 2005. Part 10 of the Criminal Justice Act 2003 lets a prosecutor, with the written consent of the Director of Public Prosecutions, ask the Court of Appeal to quash an acquittal for a “qualifying offence” listed in Schedule 5, such as murder, manslaughter and rape. The court must be satisfied that:

• there is “new and compelling evidence”, meaning evidence not used at the first trial that is reliable, substantial and highly probative; and
• a retrial is in the interests of justice, taking account of whether a fair trial is likely, the time that has passed and whether police and prosecutors acted with due diligence.

Only one application can be made for each acquittal. The best-known use is the case of Gary Dobson. He was acquitted of the 1993 murder of Stephen Lawrence in April 1996, after a private prosecution brought by Stephen’s parents collapsed when identification evidence was ruled inadmissible. On 18 May 2011 the Court of Appeal quashed the acquittal on the basis of new forensic evidence (R v Dobson [2011] EWCA Crim 1256). On 3 January 2012 an Old Bailey jury convicted Dobson and David Norris of the murder, after prosecutors relied on fibres, blood and hair linked to Stephen found on their clothing.

Frequently asked questions

Can you be tried twice if new evidence comes out after an acquittal?

In the United States, no. An acquittal is final even if strong new evidence appears, although a different sovereign could still prosecute. In England and Wales, a retrial is possible for serious offences such as murder if the Court of Appeal finds new and compelling evidence under Part 10 of the Criminal Justice Act 2003.

Does double jeopardy apply after a mistrial?

Usually not. A mistrial caused by a hung jury or another manifest necessity allows a retrial. A mistrial the defence asks for also allows a retrial unless the prosecutor deliberately provoked the request.

Can the state and federal government both prosecute me for the same act?

Yes. Under the dual sovereignty doctrine, reaffirmed in Gamble v. United States in 2019, each is a separate sovereign enforcing its own laws. Federal policy and some state statutes limit this in practice.

Is a civil lawsuit after an acquittal double jeopardy?

No. Double jeopardy only covers criminal prosecution and punishment. A victim or their family can still sue for damages, and the civil case uses a lower standard of proof.

Why might Luigi Mangione’s state murder case be dismissed?

Because New York’s Criminal Procedure Law bars a second prosecution for the same act in many cases where a case in another US court ended in a guilty plea. His lawyers say his August 2026 federal plea triggers that rule. Prosecutors say the offences target different harms. Justice Carro has not ruled.

When does jeopardy attach in a criminal case?

In a jury trial, when the jury is sworn. In a bench trial, when the first witness is sworn. With a guilty plea, when the court accepts it. Before then, charges can be dismissed and refiled.

This explainer is general information about US constitutional law, New York law and the law of England and Wales as of 12 November 2026. It is not legal advice. The Mangione proceedings are ongoing, and anyone facing criminal charges in more than one court should speak to a criminal defence lawyer in each jurisdiction.

Featured image: 100 Centre Street, the Manhattan Criminal Courts Building. Photo: Kidfly182 via Wikimedia Commons, CC BY 4.0.