21 U.S. Code § 210 - Pharmacist; unauthorized use of title
It shall be unlawful for any person whose permanent allegiance is due to the United States, not legally licensed as a pharmacist, to take, use, or exhibit the title of pharmacist, or licensed or registered pharmacist, or the title of druggist or apothecary, or any other title or description of like import.
Source(Mar. 3, 1915, ch. 74, § 10,38 Stat. 821.)