Md. Code, Agriculture § 6–107.3

(a) Except as provided in subsection (b) of this section, a person may not use, sell, or distribute for use or sale within the State any commercial feed intended for use as poultry feed that contains:

(1) Roxarsone; or

(2) Any other additive that contains arsenic.

(b) A person may use, sell, or distribute for use or sale within the State any commercial feed intended for use as poultry feed that contains histostat.