Sec. 6A.01. EQUITABLE ADJUSTMENTS TO BENEFITS. (a) Subject to this section and notwithstanding any other provision of this article, the board by at least a two-thirds vote of all trustees may consider and adopt rules requiring the equitable return of funds paid to or credited to the benefit of a member or pensioner under this article before September 1, 2017, to the extent the funds exceeded reasonable amounts that should be paid or credited given the circumstances of the pension system at the time the payment or credit was made, including the return of excessive interest credited to a member's DROP account and excessive adjustments made under Section 6.12 of this article.

(b) For purposes of Subsection (a) of this section, "reasonable amounts" includes the amounts that would have been paid or credited:

(1) if the interest rate applied in determining a benefit, including the interest rate applied to a DROP account, equaled the actual, audited rate of return of the plan at the time the interest was credited to the account; or

(2) if the percentage increase applied under Section 6.12 of this article equaled the percentage increase, if any, in the Consumer Price Index for Urban Wage Earners and Clerical Workers (CPI-W) most recently published by the Bureau of Labor Statistics of the United States Department of Labor and used by the United States Social Security Administration to provide a cost-of-living adjustment for social security benefit payments payable beginning in January of the next year.