((a)) ** Statutory provisions applicable** From the sums appropriated therefor and the allotments available under , the Secretary shall make payments as provided by to each State provided such an allotment under , for each quarter, of an amount equal to four-sevenths of the total of the sums expended by the State during such quarter in carrying out the provisions of this subchapter.section 702(c) of this titlesection 6503(a) of title 31section 702(c) of this title
((b)) ** Unobligated allotments** Any amount payable to a State under this subchapter from allotments for a fiscal year which remains unobligated at the end of such year shall remain available to such State for obligation during the next fiscal year. No payment may be made to a State under this subchapter from allotments for a fiscal year for expenditures made after the following fiscal year.
((c)) ** Reduction of payments; fair market value of supplies or equipment, value of salaries, travel expenses, etc.** The Secretary, at the request of a State, may reduce the amount of payments under subsection (a) by—
((1)) the fair market value of any supplies or equipment furnished the State, and
((2)) the amount of the pay, allowances, and travel expenses of any officer or employee of the Government when detailed to the State and the amount of any other costs incurred in connection with the detail of such officer or employee,