Md. Code, Correctional Services § 10–912

(a) On request, a correctional officer may have expunged from any file the record of a formal complaint made against the correctional officer if:

(1) the Intelligence and Investigative Division that investigated the complaint:

(i) exonerated the correctional officer of all charges in the complaint; or

(ii) determined that the charges were unsustained or unfounded; or

(2) a hearing board acquitted the correctional officer, dismissed the action, or made a finding of not guilty.

(b) There is no time requirement for expungement under paragraph (1) of this subsection.