Maryland Election Law Section 10-305
§ 10-305.
  (a)   If there is a vacancy in the polling place staff during voting hours:
    (1)   the local board may fill the vacancy with a substitute election judge who has been recruited and trained; or
    (2)   an election judge who is present at the polling place may fill the position of the absent election judge by appointing a person registered with the same party affiliation as the absent election judge.
  (b)   If a substitute election judge is appointed under subsection (a) of this section:
    (1)   either the election director, the election director's designee, or the election judge making the substitute appointment shall administer the oath required under § 10-204 of this title; and
    (2)   a chief election judge shall document any change in the polling place staff in the records of the polling place.