What can of worms are you talking about? The one where the hiring manager admits on record that he or she rejected a candidate for unethical or illegal reasons

What can of worms are you talking about? The one where the hiring manager admits on record that he or she rejected a candidate for unethical or illegal reasons opening the company to a lawsuit? Or is it the one where your external recruiter uses that feedback to coach the next applicant to trick you into hiring an incompetent?