grand jury, in law, body of persons selected to inquire into crimes committed within a certain jurisdiction. It usually comprises a greater number than the trial, or petit (also, petty) jury, having since early common law common law, system of law that prevails in England and in countries colonized by England. The name is derived from the medieval theory that the law administered by the king's courts represented the common custom of the realm, as opposed to the custom of local
..... Click the link for more information. days had between 12 and 23 members. In the United States, federal grand juries have between 16 and 23 jurors. The grand jury receives complaints and accusations in criminal cases, hears evidence adduced by the state, and approves an indictment indictment (ĭndīt`mənt), in criminal law , formal written accusation naming specific persons and crimes.
..... Click the link for more information. when satisfied that there is enough evidence against the accused to warrant a trial. It was not until the 17th cent. that the grand jury acquired its modern functions as a check on the discretion of prosecutors and a way of preventing unjustified and politically motivated prosecutions. Grand juries have investigative functions as well, and are sometimes impaneled to issue reports on, e.g., suspected official wrongdoing.

The rules governing grand jury proceedings are very different from those governing trials by (petit) jury. The public is not admitted to hearings, and witnesses can be compelled to testify. The procedure is inquisitorial rather than adversarial: the defense is not allowed to call witnesses, and the prosecutor is not obliged to present both sides of the case. Hearsay and other evidence evidence, in law, material submitted to a judge or a judicial body to resolve disputed questions of fact. The rules discussed in this article were developed in England for use in jury trials.
..... Click the link for more information. that might be excluded at a jury trial may be introduced.

The use of grand juries has declined in the 20th cent., in part because they were perceived as prone to either prosecutorial domination or abuse of their investigatory role. Britain abandoned them in the 1930s, and today fewer than half of U.S. states employ them. The information, a written statement issued by a prosecutor, has largely replaced the indictment. The Fifth Amendment to the U.S. Constitution, however, guarantees a grand jury inquiry to anyone accused in federal court of a capital "or otherwise infamous" (i.e., a felony) crime.

grand jury

Jury that examines accusations against persons suspected of committing a crime and, if the evidence warrants it, issues formal charges on which the accused are later tried (see indictment). It does not decide guilt or innocence, only whether there is “probable cause” to believe that a person committed a crime. Public officials (prosecutors and police) provide information and summon witnesses for the jury. The proceedings are usually secret. Some U.S. states have abolished the grand jury and authorize indictments by prosecutors.

grand jury

Law (esp in the US and, now rarely, in Canada) a jury of between 12 and 23 persons summoned to inquire into accusations of crime and ascertain whether the evidence is adequate to found an indictment. Abolished in Britain in 1948