An indictment is a formal written accusation, issued by a grand jury, that a person committed a serious crime and should stand trial. Understanding how an indictment works starts with a basic point: the grand jury is not deciding guilt. It is deciding whether the prosecutor’s evidence clears the “probable cause” bar, meaning there are reasonable grounds to believe a crime occurred and this person committed it. That is a much lower standard than the “beyond a reasonable doubt” a trial jury applies later.1Library of Congress. U.S. Constitution – Fifth Amendment
When an Indictment Is Required
The Fifth Amendment says no person may “be held to answer for a capital, or otherwise infamous crime, unless on a presentment or indictment of a Grand Jury.” In federal court, that means any offense punishable by death or by more than one year in prison has to begin with a grand jury indictment, unless the defendant waives that right in open court and lets the prosecutor charge by “information” instead.2Legal Information Institute. Federal Rules of Criminal Procedure Rule 7
One boundary to be aware of: this guarantee applies only in the federal system. States set their own rules. Some require grand jury indictments for serious felonies, some let prosecutors charge by information after a preliminary hearing before a judge, and some rarely use grand juries for charging at all.3Congress.gov. The Federal Grand Jury If you are trying to understand a state case, the federal process below is the model but not the rulebook.
What Happens Inside the Grand Jury Room
A federal grand jury has between 16 and 23 members, drawn from the same pools used for trial juries.4Legal Information Institute. Federal Rules of Criminal Procedure Rule 6 Unlike a trial jury, it sits for an extended term and hears many cases.
Proceedings are secret. The only people allowed in the room while the jury is in session are the prosecutor, the witness being questioned, an interpreter if needed, and a court reporter. The defendant and defense counsel are not present. There is no cross-examination, no defense case, and no judge overseeing the evidence. The prosecutor explains the law, calls witnesses, and presents documents.4Legal Information Institute. Federal Rules of Criminal Procedure Rule 6
The evidence rules are loose. Hearsay is admissible, and the prosecutor does not have to meet the standards a trial judge would enforce. That looseness is deliberate: the grand jury exists to screen cases for probable cause, not to try them.
Secrecy protects several interests at once. It shields the reputation of someone who is never charged, encourages witnesses to speak candidly, and keeps a target from fleeing or tampering with evidence before charges land. Grand jurors, the prosecutor, court reporters, and interpreters are all bound by the secrecy obligation. Witnesses, on the other hand, are generally free to discuss their own testimony after they leave.4Legal Information Institute. Federal Rules of Criminal Procedure Rule 6
The Vote: True Bill or No Bill
After hearing the evidence, the grand jury deliberates in private and votes. At least 12 jurors have to agree, no matter how many are seated. If they hit that number, they return a “true bill,” and the indictment is filed. The prosecutor can now bring the case to trial.4Legal Information Institute. Federal Rules of Criminal Procedure Rule 6
If the jury decides the evidence falls short, it returns a “no bill” and the charges do not go forward. A no bill is not an acquittal. Because no trial happened, double jeopardy does not attach, and a prosecutor can present the same case to a different grand jury later, sometimes with more evidence. There is no formal cap on how many attempts a prosecutor can make.
Sealed Indictments
Sometimes the indictment is not made public right away. A magistrate judge can order it sealed until the defendant is in custody or has been released pending trial. Sealed indictments are common when there is concern the defendant might flee, destroy evidence, or tip off co-conspirators, and they are routine in multi-defendant cases where arrests need to happen at the same time. The document is unsealed once the defendant is apprehended or appears in court.4Legal Information Institute. Federal Rules of Criminal Procedure Rule 6
After the Indictment: Arrest or Summons
Once the indictment is filed, the court issues an arrest warrant. In some cases, at the government’s request, the court instead issues a summons directing the defendant to appear on a specific date. If the defendant is already in custody, neither is needed and the case moves straight to the next stage.5Legal Information Institute. Federal Rules of Criminal Procedure Rule 9
Arraignment and Plea
The arraignment is the defendant’s first formal court appearance on the indicted charges. A judge reads the indictment or explains what it charges, and the defendant enters a plea.6Legal Information Institute. Federal Rules of Criminal Procedure Rule 10 There are three options:
- Not guilty. Almost every defendant enters this plea at arraignment, including many who will negotiate a plea deal later.
- Guilty. This moves the case to sentencing.
- Nolo contendere, or no contest. This requires the court’s permission and results in a conviction without a formal admission of guilt, which can matter in a related civil lawsuit.7Legal Information Institute. Federal Rules of Criminal Procedure Rule 11
The Bail Decision
Around the same time, a judge decides whether the defendant stays in custody or goes home pending trial. Federal law starts with a presumption of release: the judge should release the defendant on personal recognizance or an unsecured bond unless that would fail to reasonably ensure the defendant appears for court or would endanger the community.8Office of the Law Revision Counsel. 18 U.S. Code 3142 – Release or Detention of a Defendant Pending Trial
If unconditional release is too risky, the judge can attach conditions such as electronic monitoring, travel limits, drug testing, or passport surrender. A financial condition cannot be set so high that it effectively detains the defendant. Outright pretrial detention is reserved for cases where the judge finds, after a hearing, that no set of conditions can reasonably ensure both public safety and the defendant’s appearance. Factors the judge weighs include the nature of the offense, the weight of the evidence, the defendant’s personal history and community ties, and the danger release would pose. For certain charges, including violent crimes and major drug trafficking, the law creates a rebuttable presumption in favor of detention, so the defendant has to show why conditions would be enough.8Office of the Law Revision Counsel. 18 U.S. Code 3142 – Release or Detention of a Defendant Pending Trial
Challenging an Indictment
An indictment is not the last word. Defendants can file pretrial motions to dismiss, and if the grounds are known, they generally must be raised before trial.9Legal Information Institute. Federal Rules of Criminal Procedure Rule 12 Common grounds include:
- Defects in the grand jury proceeding, such as illegal selection of jurors or unauthorized persons in the room.
- Defects in the indictment itself, such as failing to state an offense, charging the same conduct in multiple counts (multiplicity), lumping separate offenses into one count (duplicity), or omitting enough detail for the defense to prepare.
- Prosecutorial misconduct, including presenting perjured testimony, misstating the law, withholding substantial exculpatory evidence, or operating under a conflict of interest.
- Constitutional violations, such as selective or vindictive prosecution, unreasonable preindictment delay, or a speedy trial violation.
- Lack of jurisdiction, a challenge that can be raised at any point in the case.
The bar for dismissal on misconduct grounds is high. Courts have been reluctant to throw out indictments unless the problem fundamentally undermined the grand jury’s independence. Most successful challenges land on narrower procedural grounds, like an indictment that does not clearly describe the alleged offense.