USADF is not required to transfer a debt to BFS pursuant to § 1506.37(b) during the period of time that the debt:
(a) Is in litigation or foreclosure;
(b) Is scheduled for sale;
(c) Is at a private collection contractor;
(d) Is at a debt collection center if the debt has been referred to a Treasury-designated debt collection center;
(e) Is being collected by internal offset; or
(f) Is covered by an exemption granted by Treasury.