(a) Any law enforcement officer who, by any means authorized in this Article, has obtained knowledge of the contents of any conversation overheard or recorded by use of an eavesdropping device or evidence derived therefrom, may disclose such contents to another law enforcement officer or prosecuting attorney to the extent that such disclosure is appropriate to the proper performance of the official duties of the person making or receiving the disclosure.
     (b) Any investigative officer, including any attorney authorized by law to prosecute or participate in the prosecution of offenses enumerated in Section 108B-3 of this Act or law enforcement officer who, by any means authorized in this Article, has obtained knowledge of the contents of any conversation overheard or recorded by use of an eavesdropping device or evidence derived therefrom, may use the contents to the extent such use is appropriate to the proper performance of his official duties.
     (c) Admissibility into evidence in any judicial, administrative, or legislative proceeding shall be as elsewhere described in this Article.