Maryland Code, Correctional Services § 7-502

(a) An individual on mandatory supervision remains in legal custody until the expiration of the individual's full term.

(b) An individual on mandatory supervision is subject to:

(c) If an incarcerated individual is convicted and sentenced to imprisonment for a crime committed while on mandatory supervision and the mandatory supervision is revoked, diminution credits that were awarded before the incarcerated individual's release on mandatory supervision may not be applied toward the incarcerated individual's term of confinement on return to the Division.