There are a few purposes of a grand jury. The main reason for having a grand jury is to make sure that there will be a fair trial.
Depending on the state you are in (some use the Grand Jury System and others use the Preliminary Hearing system) it is the hearing at which the defendant is formally charged with the offense he was arrested for.
YOU (individually) don't NEED and can't request, a Grand Jury. Grand Juries are convened at the direction of the government, not at the request of the defendant. A grand jury decides if there is enough evidence to stand trial.
The grand jury reviews the evidence against the accused
The purpose of a grand jury in the legal system is to determine whether there is enough evidence to bring criminal charges against a person. It functions by hearing evidence presented by prosecutors and deciding whether there is probable cause to indict the accused individual. Grand juries are typically made up of citizens who serve for a specific period of time and operate in secret to protect the integrity of the investigation.
Generally all felony offenses. CAUTION: Not all states indict defendants via the Grand Jury system.
Wayne L. Morse has written: 'Visit to Japan, India, Pakistan, Afghanistan, and Israel' -- subject(s): Foreign relations, Politics and government 'A survey of the grand jury system' -- subject(s): Grand jury
Grand Jury Inquiry
If the jurisdiction in question adheres to the Grand Jury system of indictment, the GJ will indict by handing down a "true bill" in the sequence in which it was presented to them. HOWEVER - if the jurisdictions NOT utilizing a Grand Jury system, your Preliminary Hearing IS your idndictiment and the presiding judge decides if there is enough Probable Cause to bind you over for trial.
More information is needed - some states do not use the Grand Jury system to indict you of an offense.
The grand jury listens to all the evidence in a case against the accused and decides whether to charge the individual with the crime. This is called an indictment or an information.
In states which do not use the Grand Jury system there is no "indictment," the defendant is simply "formally charged" with the offense by the prosecutor. .
Grand juries and Petit juries are the two kinds of juries. Grand juries review evidence of criminal action to determine if there is probable cause for bringing charges and if so, issue an indictment. Petit juries review evidence in both civil and criminal trials to determine the facts and render verdicts either for or against the parties in civil actions or guilty or not guilty in criminal actions.