Md. Const. III - Legislative Department § 19

Each House shall be judge of the qualifications and elections of its members, as prescribed by the Constitution and Laws of the State, and shall appoint its own officers, determine the rules of its own proceedings, punish a member for disorderly or disrespectful behaviour and with the consent of two–thirds of its whole number of members elected, expel a member; but no member shall be expelled a second time for the same offence.