29 C.F.R. § 20.83
Whenever a salary offset is sought by another DOL or Federal agency from a paying DOL agency, the paying DOL agency should not initiate the requested offset until it has been provided by the creditor organization with an appropriate written certification as described in § 20.82(b) . Where the creditor agency is not another DOL agency, the creditor agency must certify that its regulations under 5 U.S.C. 5514 have been approved by the Office of Personnel Management and that it, the creditor agency, has followed such regulations to the best of its information and belief. When the creditor agency is not also the paying DOL agency, the creditor agency should also be required to certify that if an administrative or judicial order is issued directing the paying DOL agency to pay a debtor an amount previously paid to the creditor agency, the creditor agency will reimburse the paying DOL agency or pay the debtor directly within 15 days of the date of the order.
29 C.F.R. §20.83