D.C. Code § 4-205.32
The Mayor shall deduct from the gross amount of any accrued statutory benefit, lump-sum payment, or settlement from any source received by a recipient of GPA (provided such money is still available to the recipient when the Mayor learns of its receipt):
Apr. 6, 1982, D.C. Law 4-101, § 532, 29 DCR 1060
1981 Ed., § 3-205.32.