Maryland Public Safety Section 13-708

      (a)      A member of the organized militia ordered into State active duty by proper authority is not liable civilly or criminally for an act done while discharging a duty.

      (b)      (1)      The court shall require a person to file security for the payment of costs that may be awarded to the defendant when the person prosecutes or begins a suit or proceeding:

                  (i)      against an officer of the organized militia for an act done by the officer in the officer's official capacity in the discharge of a duty under this title;

                  (ii)      against a person acting under the authority or order of an officer of the organized militia; or

                  (iii)      by virtue of a warrant that an officer of the militia lawfully issues.

            (2)      In all cases, the defendant may make a general denial and give evidence.

            (3)      If the case is dismissed or a verdict or judgment is rendered against the plaintiff, the defendant shall recover treble costs.