Maryland Public Safety Section 13-703

      (a)      An officer or noncommissioned officer may warn officers and enlisted individuals for duty by:

            (1)      stating the substance of the order or reading the order to the individual warned;

            (2)      leaving a copy of the order at the last known place of residence or business of the individual; or

            (3)      mailing a copy of the order to the last known residence or business address of the individual.

      (b)      (1)      If required by the officer issuing the order, the officer or noncommissioned officer giving warning shall make a return of warning containing the name of the individual warned and the time, place, and manner of warning.

            (2)      A return of warning:

                  (i)      may be verified by the officer or noncommissioned officer's oath, which may be administered by an officer; and

                  (ii)      if verified, at the trial of an individual returned as a delinquent is evidence of the facts stated in the return and is to be considered as if the officer or noncommissioned officer had testified to those facts before a court-martial at trial.