29 C.F.R. § 20.78
(b) In accordance with guidelines as may be established by the Chief Financial Officer, the creditor Labor Department agency shall send (at least 30 days prior to any deduction) written notice to the debtor, informing such debtor as appropriate:
(11) That any knowingly false or frivolous statements, representations, or evidence may subject the employee to:
(f) In any internal Labor Department collection, the provisions of § 20.78 paragraphs (a) through (e) need not be applied to any adjustment to pay which is not considered to be the result of collection of a debt, such as excess pay or allowances caused by: