Because the statute specifically mentions grand juries, it seems unlikely that there would be a different, or lower, level of protection of sources with respect to grand jury proceedings. There are no appellate court cases construing the statute in the context of a grand jury proceeding. The statute, however, does not apply to federal grand jury subpoenas. In re Grand Jury Subpoena Am. Broad. Co., 947 F. Supp. 1314 (E.D. Ark. 1996).