How much evidence do you have to have at grand jury?

It is said that grand juries are actually creatures of the prosecution these days, and that if the prosecutor presented some evidence however little a grand jury would indict a ham sandwich for murder. That being said, the grand jury needs to have enough evidence on two subjects: one, was there a crime, and two is there some reason to believe a particular individual was involved. For further discussion see the related links below. See Discussion page.