Maryland Code, State Personnel and Pensions § 29-302

(1) the Correctional Officers' Retirement System;

(2) the Employees' Retirement System;

(3) the State Police Retirement System; and

(4) the Teachers' Retirement System.

(b)(1) This subsection applies to an individual who is a member on or before June 30, 2011.

(2) A member may elect to receive a vested allowance if:

(3) A former member of the State Police Retirement System who separated from employment on or before June 30, 1989, must have at least 15 years of eligibility service to elect a vested allowance.

(4) A member is deemed to have elected a vested allowance, unless the member requests the return of the accumulated contributions before membership ends.

(b-1)(1) This subsection applies to an individual who becomes a member on or after July 1, 2011.

(2) A member is eligible to receive a vested allowance if:

(1) normal retirement age for members of:

(2) except as provided in item (3) of this subsection, age 55 for a member of the Correctional Officers' Retirement System; or

(3) age 60 for a member of the Correctional Officers' Retirement System who:

(1) is computed as a normal service retirement allowance on the basis of the former member's creditable service and average final compensation at the time of separation from employment; and

(2) may be paid in one of the optional forms of allowances under § 21-403 of this article.

(f)(1) If a former member who elected a vested allowance requests the return of accumulated contributions before payment of the vested allowance begins, the Board of Trustees shall return the accumulated contributions to the former member.

(2) When accumulated contributions are returned to a former member, the former member is not entitled to further benefits on account of the former member's previous membership.