What is the term for a preliminary hearing to determine if there is enough evidence for a trial?

A grand jury serves a crucial role in the legal system, acting as a preliminary hearing to determine if there is sufficient evidence to bring criminal charges and proceed to a full trial. This body of citizens evaluates evidence presented by a prosecutor to decide if "probable cause" exists to believe a crime has been committed and that the accused person is responsible. If they find enough evidence, they issue an indictment, which is a formal accusation. This process acts as a safeguard, protecting individuals from potentially baseless or arbitrary prosecutions by requiring a group of ordinary citizens to review the case first.

The concept of the grand jury has deep historical roots, originating in medieval England around the 12th century. King Henry II is often credited with establishing a system where local men would report crimes, a precursor to the modern grand jury. The term "grand" itself comes from the French word for "large," referring to its size, which is typically larger than a trial jury (also known as a petit jury). While a petit jury determines guilt or innocence at trial, a grand jury's function is solely to accuse or clear a suspect of charges.

In the United States, the grand jury is enshrined in the Fifth Amendment of the Constitution, highlighting its importance in the American legal framework. Unlike public trials, grand jury proceedings are typically held in secret, with only the prosecutor and witnesses present, not the defendant or their attorney. This secrecy is intended to protect the reputations of those not ultimately charged and to ensure the integrity of ongoing investigations. Due to the prosecutor's significant influence in presenting evidence, a common saying suggests that a grand jury would "indict a ham sandwich," illustrating the power prosecutors can wield in these proceedings.