Why not make candidates sign a non-liability agreement to receive feedback? Of course, choosing to ask for such feedback would be optional - but if you want it, sign the form so you agree you won't sue.
Most people would find this information quite valuable to correct their mistakes for next time. It makes the whole process much more efficient for all parties if there's quick, specific feedback.
You can't absolve a company from liability for US labor laws. So even after you sign the non-liability agreement, you can still sue. It's not a real shield for the company.
