Mississippi Code
Chapter 27 - Crimes Affecting Public Health
§ 97-27-25. Poisons; arsenic to be mixed with soot or indigo

A druggist, apothecary, or other person shall not sell or give away, except to physicians, any quantity of arsenic less than one pound without first mixing soot or indigo therewith in the proportion of one ounce of soot or half an ounce of indigo to the pound of arsenic.