Md. Code, Health - General § 22–201

(a) A person may not sell or otherwise provide bichloride of mercury in a tablet that contains more than one-tenth of a grain of bichloride of mercury unless the tablet:

(1) Has the word “Poison” impressed or embossed on it;

(2) Is triangular, diamond, square, oblong, or irregular in shape;

(3) Is blue, green, or purple in color; and

(4) Is contained in a bottle that has the word “Poison” blown in one side of the bottle and a label on the opposite side that bears the word “Poison” in conspicuous letters.

(b) A person who violates any provision of this section is guilty of a misdemeanor and on conviction is subject to a fine not exceeding $100 or imprisonment in jail not exceeding 3 months, or both.