(b) In addition to the state aid provided in paragraph (a) of this subdivision, each county, the salary of the district attorney of which is determined pursuant to section one hundred eighty-three-a of the judiciary law, shall be entitled to receive state aid in the amount of forty-one percent of the difference between the amount required to be paid to such district attorney pursuant to section one hundred eighty-three-a of the judiciary law on and after January first, nineteen hundred ninety-nine and the amount required to be paid pursuant to such section immediately prior to such date, except that in the county of Dutchess the amount shall be forty-two percent of such difference in the county of Putnam the amount shall be forty percent of such difference in the county of Monroe the amount shall be thirty-nine percent of such difference and in the counties of Erie, Nassau, Suffolk and Westchester the amount shall be thirty-six percent of such difference.

(c) Commencing with the nineteen hundred eighty-seven calendar year, the comptroller shall annually determine the amount of state aid payable to each county pursuant to paragraphs (a) and (b) hereof for each calendar year and shall pay such amount on his audit and warrant to the chief fiscal officer of each such county during the month of September in each such year. Where a county first becomes entitled to state aid pursuant to paragraphs (a) and (b) hereof on a day other than January first, nineteen hundred ninety-nine or January first of any other year thereafter, the amount of state aid payable to such county in the year it first becomes entitled to such state aid shall be prorated accordingly. 13. In order to provide services to crime victims, witnesses, and other persons involved in the criminal justice system, and to support crime prevention programs, the district attorney may employ or contract with persons licensed and registered to practice or otherwise authorized under article one hundred fifty-three, one hundred fifty-four, or one hundred sixty-three of the education law, or contract with entities authorized to provide the services specified in such articles, in connection with the provision of any services that such persons or entities are authorized to provide and that are authorized by the district attorney.