All social records, including presentence reports, pre-parole reports and supervision histories, obtained by the board are privileged and shall not be disclosed directly or indirectly to anyone other than the board, director, sentencing guidelines commission or sentencing judge, but authorities of the institution in which the prisoner is confined shall have access to all records and reports concerning the prisoner, and the sentencing judge, board and director shall have access to all records concerning the prisoner. The board, in the case of parole records, and the sentencing judge, in the case of probation records, in their discretion, whenever the best interest or welfare of a particular probationer or prisoner makes such action desirable or helpful, may permit inspection of the reports, or parts thereof, by the probationer, prisoner or his attorney. The sentencing guidelines commission shall have access to the social records for statistical and policymaking purposes only and shall not release any information identifying any individual.