Let me illustrate, I am not getting thru.Again, I don’t interview 1 person for each position, I interview multiple candidates, then, if I exclude one I have more to choose from.
Do you interview ALL applicants? Of course not. You screen their apps. Now you will have one less tool to screen the apps before the interview.
Last year you had 50 applicants, 20 passed application review, you excluded 2 apps with criminal records, you interview 5 people for a job (you will never interview all 20 who passed app and resume review, you narrow down to top 5 based on the apps and resumes), make an offer, they pass background check. They are hired.
Now you have 50 apps, 20 passed the application review, including 2 with criminal records. You interviewed 5, including 2 criminals. 2 honest applicants were not interviewed, because criminals took their places in the interview process. You make job offer to 1 of the criminals. They do not pass the check, you go down the line to the other 4 interviewed. Hopefully your alternate is not the second criminal. Otherwise you go to your 3rd alternate. All that time 2 of the qualified applicants were not interviewed and they could have been the best pick for the job.
