D.C. Mun. Regs. tit. 25-B, § 406
406.1 Persons working in direct contact with food, equipment, utensils, food-contact surfaces, or food-packaging materials shall not wear jewelry, including medical information jewelry on their arms and hands, except for a plain ring such as a wedding band.
SOURCE: Final Rulemaking published at 56 DCR 5245 (July 3, 2009).