Md. Code, State Personnel and Pensions § 23–406

(a) The Board of Trustees shall reduce a member’s allowance if the member:

(1) received any accumulated contributions, other than additional contributions, in connection with a prior separation from employment;

(2) is credited with prior eligibility service; and

(3) does not repay, with interest to the date of retirement, the amount received.

(b) A reduction under subsection (a) of this section shall equal the actuarial equivalent of the amount, including interest, that is not repaid.