D.C. Code § 13-338
An order for the substitution of publication for personal service may not be made until:
(a)
(2) The plaintiff proves by affidavit to the satisfaction of the court:
Dec. 23, 1963, 77 Stat. 514, Pub. L. 88-241, § 1
May 10, 2019, D.C. Law 22-313, § 12
1973 Ed., § 13-338.
1981 Ed., § 13-338.