Maryland Constitution of 1867 Art. 1, § 3

(a) The General Assembly shall have the power to provide by suitable enactment for voting by qualified voters of the State of Maryland who are absent at the time of any election in which they are entitled to vote, for voting by other qualified voters who are unable to vote personally, or for voting by qualified voters who might otherwise choose to vote by absentee ballot, and for the manner in which and the time and place at which such voters may vote, and for the canvass and return of their votes.

(b) The General Assembly shall have the power to provide by suitable enactment a process to allow qualified voters to vote at polling places in or outside their election districts or wards or, during the two weeks immediately preceding an election, on no more than 10 other days prior to the dates specified in this Constitution.