Sorting out process and employer is looking for good people. Probably a position where employer has lot of liability or around high theft items. Or recently got burned because of a bad hire. Or employer spends lots of money to train you. I had same thing happen to me. 27 years later retired from the place that had real low rate of applicants to actual new hires. Our place had me go to a "private detective" for polygraph. He did nothing but ask me if my app was filled out right. He preached to me how I could be fired for a false app etc.
In todays market...between drug tests and other hurdles, it a sorting out process. Keep your name in the hat, show up.