D.C. Mun. Regs. tit. 17, r. 17-6012
Any person who qualified under this chapter and whose application for an advanced practice registered nurse practitioner certificate has been approved by the Board shall have the right to use the title "advanced practice registered nurse" and clinical nurse specialist may use the title or abbreviation designated by the approved national certifying body. No other person shall assume such title or use such abbreviation. No other person shall use any other title, words, letter, signs, or figures to indicate that the person using the name is recognized as a certified registered clinical nurse specialist. Only persons certified as a Clinical Nurse Specialist by the Board shall be designated as such and have the right to use the title "Clinical Nurse Specialist" ("CNS").
D.C. Mun. Regs. tit. 17, r. 17-6012