How does the Fifth Amendment Grand Jury Clause work?

The Fifth Amendment to the United States Constitution, ratified December 15, 1791 as part of the Bill of Rights, opens with the grand jury clause: 'No person shall be held to answer for a capital, or otherwise infamous crime, unless on a presentment or indictment of a Grand Jury, except in cases arising in the land or naval forces, or in the Militia, when in actual service in time of War or public danger.' The clause requires that any person charged with a federal felony -- a capital offense or an 'infamous crime,' interpreted to include any offense for which imprisonment in a penitentiary is authorized -- must first be indicted by a grand jury before standing trial. A federal grand jury consists of 16 to 23 citizens drawn from the community; an indictment requires the affirmative vote of at least 12 grand jurors, a majority of the minimum quorum. Grand jury proceedings are held in private: the target of the investigation has no right to appear, present evidence, or confront witnesses unless invited, and the target's attorney may not be present during testimony. The secrecy protects the integrity of the investigation, shields witnesses from retaliation, and prevents targets from fleeing or destroying evidence before charges are filed. The grand jury serves a dual constitutional function: as an investigative body with subpoena power to compel the production of documents and testimony, and as an accusatory body -- sometimes called the shield of the innocent -- that interposes a lay citizen check between the executive branch's prosecution power and the accused. A presentment is an indictment initiated by the grand jury on its own motion, without a formal request from the prosecutor; in practice the grand jury almost always acts on the prosecutor's presentation, making presentments rare. The military exception in the clause -- cases arising in the land or naval forces during actual service in time of war or public danger -- reflects the founders' recognition that separate military justice jurisdiction is constitutionally appropriate for service members, and its scope has been construed broadly by the Supreme Court in cases addressing court-martial jurisdiction.

The grand jury clause stands alone among criminal-procedure provisions of the Bill of Rights: it has never been incorporated against the states through the Fourteenth Amendment. In Hurtado v. California, 110 U.S. 516 (1884), the Supreme Court held, 7-1, that the Due Process Clause of the Fourteenth Amendment does not require states to initiate serious criminal prosecutions by grand jury indictment. Joseph Hurtado was charged with the murder of Jose Estuardo by a California information -- a formal written charge filed directly by the district attorney -- rather than by grand jury indictment. California had abolished the mandatory grand jury requirement for felony prosecutions by state constitutional amendment in 1879. Hurtado argued that the California procedure denied him the due process of law guaranteed by the Fourteenth Amendment. Justice Stanley Matthews wrote for the Court, articulating a principle that would become foundational: the Due Process Clause of the Fourteenth Amendment does not freeze into federal constitutional law every procedure that was recognized at common law or embodied in the Bill of Rights as of 1791. To read the Fourteenth Amendment as incorporating every Bill of Rights guarantee applicable to federal proceedings would render the Fifth Amendment's own Due Process Clause redundant, because the Fourteenth Amendment's language tracks the Fifth's -- and if the Fifth Amendment's Due Process Clause already required grand juries at the federal level by its own terms, requiring it again under the Fourteenth would be circular. States may develop their own procedural methods adequate to fundamental fairness without being confined to the specific forms the First Congress chose for federal proceedings. Hurtado has never been overruled. The grand jury clause remains the only Bill of Rights provision protecting criminal defendants that has not been incorporated against the states. The practical consequence is substantial: more than half the states have eliminated or substantially reduced the mandatory grand jury requirement for felony prosecutions, permitting district attorneys to file formal charges directly after a judicial probable-cause determination at a preliminary hearing. Other states retain grand juries as a constitutional requirement under their own state constitutions -- a matter of state law entirely independent of the federal constitutional floor that Hurtado established.

Even when a federal grand jury is convened, the evidentiary standards that govern its deliberations are more permissive than those that apply at trial. Costello v. United States, 350 U.S. 359 (1956), resolved whether an indictment returned on the basis of hearsay evidence alone is constitutionally valid. Frank Costello, an organized crime figure, challenged his federal tax-evasion indictment on the ground that the government had presented only hearsay summaries of voluminous records compiled by revenue agents, rather than the underlying documents or live testimony from witnesses with personal knowledge of the facts. Justice Hugo Black wrote for a unanimous Court upholding the indictment. The Fifth Amendment grand jury clause does not limit the kind of evidence the grand jury may consider; the grand jury is not a trial and its deliberations are not governed by the exclusionary rule, the hearsay rule, or the other evidentiary restrictions that protect defendants at trial. A grand jury proceeding is investigative -- its function is to determine whether probable cause exists to charge, not to adjudicate guilt -- and that investigative character justifies a less restrictive evidentiary environment. Requiring the government to meet trial-like evidentiary standards before the grand jury would impose 'a radical change in the long-established constitutional structure' and would delay and complicate investigations without any clear constitutional warrant. Costello's rule has been reaffirmed repeatedly: grand juries may hear testimony from witnesses who lack firsthand knowledge, may consider summaries of documentary evidence, and may rely on testimony about out-of-court statements. The only absolute evidentiary limitation is that an indictment cannot stand if it was obtained through the knowing use of perjured testimony, which is a due process violation separate from the grand jury clause. The permissive Costello standard means that a grand jury subpoena recipient's best protection against a baseless indictment is the grand jurors themselves, not an adversarial hearing where the target could challenge the government's evidence.

United States v. Williams, 504 U.S. 36 (1992), resolved whether federal courts may exercise their supervisory authority over federal proceedings to dismiss an indictment on the ground that the prosecutor withheld exculpatory evidence from the grand jury. John H. Williams Jr. was a savings and loan operator indicted for fraud. Evidence tending to negate his fraudulent intent existed -- documents the government chose not to present to the grand jury. Williams moved to dismiss the indictment, arguing that the prosecutor had violated a supervisory-power obligation to disclose all material exculpatory evidence. The Tenth Circuit agreed. Justice Antonin Scalia reversed for a five-to-four majority. The Fifth Amendment grand jury clause establishes the grand jury as a constitutional institution independent of both the executive and judicial branches: it is an accusatory body that stands between the government and the accused, not an adjudicatory body subject to judicial supervision on the merits of its evidentiary choices. Because the grand jury derives its authority from the Constitution rather than from any act of Congress or judicial rulemaking, the federal courts' supervisory power over their own proceedings does not extend to supervising the grand jury's deliberations or dictating what evidence the prosecutor must present. Imposing an obligation to present exculpatory evidence would alter the grand jury's historical and constitutional character as an ex parte accusatory body; the prosecutor appears before the grand jury in an adversarial posture. The dissenters, led by Justice John Paul Stevens, argued that the supervisory power was broad enough to require basic fairness and that deliberate withholding of evidence known to be exculpatory violated that standard. Williams means that an indictment cannot be challenged -- and cannot be dismissed -- solely on the ground that the government failed to disclose exculpatory evidence to the grand jury; the remedy for prosecutorial overreach in grand jury presentations is professional discipline or political accountability, not judicial dismissal.

The Fifth Amendment grand jury clause is directly relevant to several debates that will shape the 2028 presidential election. Grand jury investigations -- conducted in secret, capable of issuing compulsory subpoenas for documents and testimony, and not subject to ordinary evidentiary rules under Costello -- are the principal instrument by which the Department of Justice pursues complex federal criminal cases, including campaign finance violations, public corruption, and national-security offenses. The Williams rule that prosecutors have no court-enforceable duty to present exculpatory evidence concentrates substantial power in the hands of the prosecutors who control grand jury presentations, making the independence and accountability of the prosecutor's office a recurring political issue. The Hurtado non-incorporation rule means that parallel state prosecutions -- including prosecutions for violations of state election laws and state ethics statutes -- may proceed by information without any grand jury check; that asymmetry matters because federal pardons extinguish federal criminal liability but have no effect on state prosecutorial authority. Under the dual-sovereignty doctrine reaffirmed in Gamble v. United States, 587 U.S. 678 (2019), the federal government and each state are separate sovereigns permitted to prosecute the same underlying conduct under their own laws, and a federal pardon does not bar a subsequent state prosecution, which in a state with an information system requires no grand jury indictment at all. The 2028 winner's judicial nominees -- confirmed or blocked by the thirty-three Class II Senate seats on the November 2028 ballot -- will shape the next generation of decisions interpreting the grand jury clause's scope, the limits of prosecutorial power before the grand jury, and the contours of the dual-sovereignty exception to double jeopardy protection in the context of politically charged federal investigations.