Maryland Code, Election Law § 16-303

(1) interfere in any way with the casting of a vote by a person who the election judge knows is lawfully entitled to vote at an election;

(2) fail to challenge a person who the election judge has reason to believe is not entitled to vote;

(3) refuse to follow the instructions of the election director with respect to the qualification of voters, the use of voting equipment, or the casting of votes; or

(4) obstruct the view at any time of any person, lawfully present in the polling place, who wishes to see the ballot box or voting equipment used during an election.