Hogwash! I spend years on a federal grand jury and all who participated as jury or witnesses were admonished not to discuss anything that occurred in the room.
When Sidney Blumenthal testified before Ken Starr's Grand Jury, he emerged from the building, stepped up to the cameras and said, "I told them ..." and reeled off his supposed testimony. Of course, later events proved that he lied his ass off about what he actually said in his testimony. So is the fact that he made up what he said about his testimony what saved him from being in violation of some law?