Section 906. 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  head 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,  may assign counsel to assist the commission in the conduct
  of its investigative or prosecutorial functions.