Special counsel may be present during the investigatory stage of a multi-jurisdiction grand jury proceeding and may examine any witness who is called to testify or produce evidence. The examination of a witness by special counsel shall in no way affect the right of any grand juror to examine the witness. At the request of special counsel, the presiding judge shall designate specialized personnel for investigative purposes. Such personnel shall be designated as a sworn investigator and shall be administered an oath to maintain the secrecy of all proceedings of the multi-jurisdiction grand jury. A sworn investigator is permitted to discuss multi-jurisdiction grand jury proceedings with any other sworn investigator or special counsel and may participate in multi-jurisdiction grand jury proceedings at the request of special counsel or the grand jury. Any specialized personnel who have been administered an oath to maintain the secrecy of all proceedings of the multi-jurisdiction grand jury before July 1, 2014, and who continue to serve in that position are deemed to be sworn investigators under this section. Special counsel and sworn investigators, however, may not be present at any time during the deliberations of a multi-jurisdiction grand jury except when the grand jury requests the legal advice of special counsel as to specific questions of law.