D.C. Mun. Regs. tit. 16, r. 16-631
For each consumer goods repair category or specialty for which a consumer goods repair dealer has been issued a license under this chapter, the dealer shall retain the services of at least one (1) supervisory inspector licensed under § 603 to serve in that category or specialty, except as otherwise provided in this section.
If a repair dealer is licensed to perform repair services in a single repair industry category which includes several specialties, that dealer need not retain a licensed supervisory inspector licensed in that category if that consumer goods repair dealer employs for each and every specialty in which the dealer provides services a supervisory inspector licensed to serve in that specialty.
Repair dealers who perform no repair services within their establishments or provide repair services in specific categories only through subcontract with other repair dealers shall not be required to employ or designate supervisory inspectors in those categories.
D.C. Mun. Regs. tit. 16, r. 16-631