Prosecution by information or indictment. Grand jury

Offenses heretofore required to be prosecuted by indictment, shall be prosecuted by information after examination and commitment by a magistrate, unless the examination be waived by the accused with the consent of the State, or by indictment, with or without such examination and commitment. The grand jury shall consist of seven persons, five of whom must concur to find an indictment; but no grand jury shall be drawn or summoned unless in the opinion of the judge of the district, public interest demands it.