The following excerpt is from In re Weir, 377 F. Supp. 919 (S.D. Cal. 1974):
A grand jury proceeding is not an adversary hearing in which the guilt or innocence of an accused is adjudicated. Rather it is an ex parte investigation to determine whether a crime has been committed and whether criminal proceedings should be instituted against any person. The grand jury's investigative powers must be broad if its public responsibility is adequately to be discharged. Branzburg v. Hayes, 408 U.S. 665, 700, 92 S.Ct. 2646, 33 L.Ed.2d 626 (1972).
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