Grand Juries: Indictment Process and How They Differ from Trial Juries

The Hidden Gatekeepers of Federal Prosecution

Every year, federal grand juries across the United States return tens of thousands of indictments — and virtually none of those proceedings are open to the public, the press, or the accused. The grand jury operates in near-total secrecy, hearing evidence the defense cannot challenge, applying a legal standard the courts rarely review. Critics call it a rubber stamp. Supporters call it a vital constitutional check. Understanding how grand juries actually work requires separating the constitutional theory from the prosecutorial reality.

Constitutional Basis and Historical Origins

The grand jury is one of the oldest institutions in Anglo-American law. It traces its origins to the Assize of Clarendon in 1166, issued by Henry II, which established a panel of local men to present criminal accusations to the king's judges. The institution evolved over centuries as a check against crown overreach — most famously refusing to indict political opponents of the Crown in high-profile cases during the 17th century.

The Fifth Amendment to the U.S. Constitution enshrines grand jury indictment for federal felonies: "No person shall be held to answer for a capital, or otherwise infamous crime, unless on a presentment or indictment of a Grand Jury." This right applies only to federal prosecutions. The Supreme Court held in Hurtado v. California (1884) that the grand jury requirement is not incorporated against the states through the Fourteenth Amendment. As a result, about half of U.S. states have replaced the grand jury with a preliminary hearing before a judge for felony cases.

Composition and Selection

Federal grand juries consist of 16 to 23 citizens drawn from the district where the charges will be prosecuted. Selection follows the same random process as trial jury selection — potential jurors are summoned from voter registration and driver's license rolls. However, unlike trial juries, grand jurors are not closely questioned on their views about the specific case; the selection process is far less intensive.

A grand jury typically sits for 18 months in the federal system, though a court may extend its term up to 36 months in complex investigations. During that time, it may hear evidence in dozens of separate investigations. Grand jurors are not sequestered. They return to their ordinary lives between sessions.

How the Indictment Process Works

Prosecutors present evidence to the grand jury through witnesses and documents. The rules of evidence are relaxed — hearsay is admissible, illegally obtained evidence may be presented (though it would be excluded at trial), and there is no defense attorney cross-examining witnesses. The target of the investigation has no right to appear and present their side, though in practice prosecutors sometimes invite targets to testify voluntarily.

After hearing the evidence, the grand jury votes in secret without the prosecutor present. If at least 12 of the 23 federal grand jurors find probable cause — a reasonable belief that the target committed the charged crime — they return a "true bill," which is the formal indictment. If they decline, they return a "no bill" and charges are not filed. In practice, no-bills are rare. Studies consistently show federal grand juries decline to indict in fewer than 1 percent of cases presented.

• Subpoena power: Grand juries can compel witness testimony and document production through subpoenas. Refusal to comply without a valid legal privilege constitutes contempt of court.
• Immunity grants: Prosecutors may offer witnesses immunity from prosecution in exchange for testimony. Two types exist — use immunity (testimony cannot be used against the witness) and transactional immunity (broader protection from prosecution for the conduct discussed).
• Grand jury secrecy: Federal Rule of Criminal Procedure 6(e) imposes strict secrecy requirements on grand jury proceedings. Jurors, prosecutors, and court personnel generally cannot disclose what transpired. The target has no right to the transcript before trial.

State Grand Jury Practice

About 22 states still require grand jury indictment for some or all felony charges. The rest allow prosecutors to proceed by criminal information — a formal charging document filed directly by the prosecutor — typically following a preliminary hearing before a judge who makes a probable cause determination. States that retain grand juries often have their own procedural rules that differ significantly from the federal model.

State grand juries have been the center of high-profile controversies. The 2014 grand jury decisions not to indict officers involved in the deaths of Michael Brown in Ferguson, Missouri, and Eric Garner in New York City sparked national debate about whether grand jury secrecy and prosecutorial control over the process undermines accountability in police misconduct cases.

Special Purpose Grand Juries

Beyond standard criminal grand juries, some jurisdictions convene special grand juries for specific purposes. Federal law provides for special grand juries to investigate organized crime. Several states authorize investigative grand juries that operate independently of specific criminal charges, producing public reports on corruption or governmental misconduct — a function the ordinary grand jury does not perform.

Criticisms and Reform Debates

The grand jury has accumulated substantial criticism over the past century. Prosecutors control the flow of evidence, which witnesses testify, and how legal standards are explained to jurors. No judge oversees deliberations. Defense attorneys are excluded entirely. Clarence Darrow called the grand jury "the great inquisition of the land." A 1973 study by the American Bar Association found that grand juries follow prosecutorial recommendations in over 99 percent of federal cases.

• Reform advocates argue that mandatory preliminary hearings before a neutral judge would provide more meaningful screening of charges.
• Defenders contend that grand juries bring lay citizen judgment to prosecutorial decisions and that they have historically protected unpopular defendants from politically motivated prosecution.
• The debate intensified after high-profile cases in the 2010s made grand jury secrecy a major public concern.

Target, Subject, and Witness: Three Very Different Roles

People who appear before grand juries occupy distinct legal positions. A target is a person the prosecutor believes committed the crime under investigation. A subject is someone whose conduct is within the scope of the investigation. A witness is present only to provide information. Targets have the right to assert Fifth Amendment protection against self-incrimination and decline to answer any question. Witnesses must testify unless a valid privilege applies. This distinction matters enormously for legal strategy. This article is for informational purposes only and does not constitute legal advice.