D.C. Criminal Code § 509

(1)Any person who is involved in the commission of a crime, and playing an active part in its commission, failing to report the occurrence of such offense to the relevant authorities, or fails to otherwise reasonably attempt to prevent the crime from occurring when such crime occurring involves the subject, and the subject has ample opportunity to attempt to do so, shall be guilty of aiding and abetting. (2)This shall be a Class E Offense.