D.C. Mun. Regs. tit. 29, § 12203
12203.1 Settlement funds identified through a CSSD data match with CSLN shall be subject to the filing of a lien when:
(a) There is an active child support case;
(b) The child support order has accumulated arrears greater than or equal to five hundred dollars ($500); and
(c) The child support obligor resides or owns property in the District at the time the funds are identified.
SOURCE: Final Rulemaking published at 62 DCR 1061 (August 7, 2015).