Md. Code, Pub. Safety § 3-315

(a) An individual may not exercise or attempt to exercise any of the powers of a special police officer granted under this subtitle without a commission. (b) (1) An individual may not exercise or attempt to exercise any of the powers of a special police officer granted under this subtitle if the individual knows of the suspension or termination of the individual’s commission or if the individual has in any manner received notice of the suspension or termination of the individual’s commission. (2) An individual is presumed to know of a suspension or termination if notice of the suspension or termination is filed and mailed in accordance with § 3-313 of this subtitle. (c) An employer may not knowingly: (1) hire an individual to perform the duties of a special police officer unless the individual holds a commission; or (2) continue to employ an individual to perform the duties of a special police officer: (i) unless the individual holds a commission; or (ii) if the individual’s commission is suspended or terminated. (d) A person who violates this section is guilty of a misdemeanor and on conviction is subject to imprisonment not exceeding 6 months or a fine not exceeding $1,000 or both.