(a) The retirement system shall deposit in the law enforcement and custodial officer supplemental retirement fund state contributions and other appropriations made by the legislature to the fund and proceeds from investment of the fund.
(a-1) The comptroller shall deposit fees collected under § 133.102(e)(7), Local Government Code, to the credit of the law enforcement and custodial officer supplemental retirement fund.

(b) The retirement system may use money from the fund only to pay supplemental retirement and death benefits to law enforcement and custodial officers as provided by this subtitle and to pay for the administration of the fund.
(c) Money appropriated to pay benefits from the fund as provided by this subtitle may not be diverted or used to pay any other benefits.
(d) Member contributions to the fund deducted under § 815.402(h) or 820.101(b), as applicable:
(1) earn interest at the same rate as money in an individual account in the employees saving account under § 815.311; and
(2) are subject to the same computations and limitations that apply to member contributions under § 815.311.