California law requires Superior Court Judges in each California County to impanel a civil grand jury. Civil grand juries investigate local government activities. At the end of the year, grand juries publish reports about what they have found.
Grand jurors are bound by secrecy and confidentiality in grand jury service. Each member of the grand jury, under Penal Code section 911, swears an oath of office to not disclose any evidence brought before the grand jury, nor any discussions or deliberations that occur during a grand jury investigation. This oath ensures protection for those who come before the grand jury and maintains the independence and validity of the grand jury.