Maryland Code, State Personnel and Pensions § 25-305

(1)(i) would have been entitled to purchase service credit under the Employees' Retirement System; and

(ii) is not otherwise entitled to service credit under the Correctional Officers' Retirement System; or

(i) complete a claim for the service credit and file it with the Board of Trustees on a form that the Board of Trustees provides; and

(ii) pay to the Board of Trustees in a single payment the member contributions the member would have made for the period of employment for which service credit is being purchased plus regular interest to the date of payment.