D.C. Mun. Regs. tit. 29, § 551
551.1 A patient who is transported by ambulance between facilities, where the point of origin is within the District of Columbia, shall only be transported by a certified District of Columbia Emergency Medical Services Agency ambulance except when the transporting agency has been requested through a mutual aid agreement or memorandum of understanding by the Department of Health.
551.2 A transporting agency that is not District-certified shall adhere to the protocols of its local jurisdiction unless otherwise specified through a mutual aid agreement or memorandum of understanding.
551.3 Patients shall be transported to the appropriate heath care facility as outlined in the agency's protocol.
SOURCE: Final Rulemaking published at 60 DCR 16569 (December 6, 2013).