Section 63. Expenses of committees

Whenever by resolution of either house,
  a committee or joint committee duly appointed pursuant thereto shall  be
  directed  to conduct an investigation or take testimony, the comptroller
  shall draw his warrant for the  payment  of  the  actual  and  necessary
  expenses  of  the  committee  or  subcommittee  having  in  charge  such
  investigation, inquiry or taking of testimony, and of the  officers  and
  employees  authorized  to  accompany  them,  upon  the  rendition  of an
  itemized bill  of  such  expenses  certified  by  the  chairman  of  the
  committee,  and approved by the temporary president of the senate in the
  case of a senate committee, or the speaker of the assembly in  the  case
  of  an  assembly  committee,  or  by both such officers in the case of a
  joint committee, or by his or their designee or designees, respectively,
  and upon proof by affidavit or otherwise that the same is due.
    Such designation shall be in writing and filed in the office  of  such
  officer  or  officers  and  in  the  office of the comptroller and shall
  remain in effect during the term of office of such officer  or  officers
  unless  sooner  revoked.  The approval of any such designee shall be for
  expenses other than personal service and in amounts not  to  exceed  the
  sum fixed in such designation for any such item.