The presentence report, the preparole report, the pre-postrelease supervision report and the supervision history, obtained in the discharge of official duty by any member or employee of the prisoner review board or any other employee of the department of corrections, shall be privileged and shall not be disclosed directly or indirectly to anyone other than the prisoner review board, the judge, the attorney general or others entitled to receive the information, except that the board, secretary of corrections or court may permit the inspection of the report or parts of it by the defendant, inmate, defendant’s or inmate’s attorney or other person having a proper interest in it, whenever the best interest or welfare of a particular defendant or inmate makes the action desirable or helpful.