(a) General rule.--Before submitting an investigation to the investigating grand jury the attorney for the Commonwealth shall submit a notice to the supervising judge. This notice shall allege that the matter in question should be brought to the attention of the investigating grand jury because the investigative resources of the grand jury are necessary for proper investigation. The notice shall allege that one or more of the investigative resources of the grand jury are required in order to adequately investigate the matter.
(b) Effect of notice.--After the attorney for the Commonwealth has filed the notice submitting a matter to the investigating grand jury any or all of the investigative resources of the investigating grand jury may be used as regards the investigation.