Every security agency that advertises its business to the public, and every person, firm, or corporation licensed as a private detective agency under Chapter 20 of this title, that provides private detective services for a fee or other consideration, and that advertises its business to the public, shall include its license number in each advertisement.
No person shall attach to his or her personal motor vehicle any sign, plate, insignia, or other designation identifying the driver or owner as a security officer. This shall not prevent the placement of this type of identification on any car owned, leased, or otherwise used in the business of any agency or employer.
D.C. Mun. Regs. tit. 17, r. 17-2110