Section 705. Prosecution fund

The board of supervisors shall have power to
  appropriate and set aside a fund for the payment in advance of audit  of
  expenditures  incurred  by  the  district  attorney, or attorney general
  acting  under  section  sixty-two  of  the  executive  law,  necessarily
  incurred  in the prosecution of criminal actions and proceedings arising
  in the county.  The board of supervisors may provide for  such  district
  attorney  or  attorney general to issue orders upon the county treasurer
  for such payment, the countersignature of the chairman of  a  designated
  committee  of  such board, accounting of such expenditures with verified
  or certified vouchers attached thereto and  such  other  conditions  and
  rules  as  may  be deemed necessary. The claimant, district attorney and
  the attorney general in actions or proceedings prosecuted by  him  shall
  be  jointly  and  severally liable for any item of expenditure for other
  than a lawful county purpose  disallowed  upon  a  final  audit,  to  be
  recovered  in an action brought against them by the board of supervisors
  in the name of the county.