Maryland Code, Election Law § 10-305

(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.

(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.