Section 8-106. Relations with city departments and agencies

So far as
  practicable and subject to the approval of the mayor,  the  services  of
  all other city departments and agencies shall be made available by their
  respective heads to the commission for the carrying out of the functions
  herein  stated.  The  head  of  any  department  or agency shall furnish
  information in the possession of such  department  or  agency  when  the
  commission  so  requests.  The  corporation counsel, upon request of the
  chairperson  of  the  commission,  may  assign  counsel  to  assist  the
  commission   in  the  conduct  of  its  investigatory  or  prosecutorial
  functions.