D.C. Mun. Regs. tit. 25-D, § 1500
1500
SERVICE OF NOTICE – PROPER METHODS
1500.1
A notice issued in accordance with section 3102 of Title 16 of the District of Columbia Municipal Regulations and these regulations shall be deemed properly served if it is served by one of the following methods:
(a) The notice is personally served by the Department, a law enforcement officer, or person authorized to serve civil process and service is made to the licensee, or person operating a massage establishment or health spa facility without a license;
(b) The notice is sent by the Department to the last known address of the licensee, or person operating a massage establishment or health spa facility without a license by other public means so that a written acknowledgment of receipt may be acquired; or
(c) For civil infraction penalties, the notice is provided by the Department in accordance with the procedures stated in section 3102 of Title 16 of the District of Columbia Municipal Regulations.
Source: Final Rulemaking published at 56 DCR 7975 (October 9, 2009).