In determining whether any work is eligible to be considered a work made for hire under paragraph (2), neither the amendment contained in section 1011(d) of the Intellectual Property and Communications Omnibus Reform Act of 1999, as enacted by section 1000(a)(9) of Public Law 106–113, nor the deletion of the words added by that amendment—
(A) shall be considered or otherwise given any legal significance, or
(B) shall be interpreted to indicate congressional approval or disapproval of, or acquiescence in, any judicial determination,
by the courts or the Copyright Office. Paragraph (2) shall be interpreted as if both section 2(a)(1) of the Work Made For Hire and Copyright Corrections Act of 2000 and section 1011(d) of the Intellectual Property and Communications Omnibus Reform Act of 1999, as enacted by section 1000(a)(9) of Public Law 106–113, were never enacted, and without regard to any inaction or awareness by the Congress at any time of any judicial determinations."
Now your turn, quote the full passage of whatever law you think creates this "duty of due diligence" that you've been talking about.