49 C.F.R. § 89.7

The authority delegated under § 89.5 does not apply to any claim:

(a) As to which there is an indication of (1) fraud; (2) the presentation of a false claim; or (3) misrepresentation on the part of the debtor or any other party having an interest in the claim;

(b) Based on tax statutes; or

(c) Arising from an exception made by the General Accounting Office in the account of an accountable officer.