Which one do you hire?
(1) The candidate with a face tattoo and ear gauges (holes) who was observed to "roll coal" when he left the interview in a lifted truck with entirely too many skulls and anarchist emblems.
(2) The one with an extremely thick accent that is near unintelligible. [HR says he has a top TOEFL score and satisfies the "speaks English" requirement.]
(3) The candidate who showed up a little late, a little underdressed, a little distracted--maybe demure--, and who just generally didn't seem to want the job.
(4) The candidate who is enthusiastic, pleasant, good at small talk, and who uses the "do you have any questions for us?" part of the interview to ask surprisingly pertinent/proactive questions about the challenges your team is facing instead of focusing on benefits/pay etc.
You might argue that many of the attributes I've mentioned are valid "professional qualifications". But remember, that term--under OPs law--will not be your notion of qualifications: it'll be a contorted mess of statue plus case law plus HR policies plus things you can clearly articulate in advance in the job criteria and prove to some jury against a plantiff with a sob story.