Zack had a pattern of scanning the screens under his inspection. Top row, left to right, next, right to left, and so on. He zigzagged back and forth top to bottom and then started again up at the top row.
Sometimes something would catch his eye and he'd stop and watch for a while. Nothing he had to mark as suspicious for the supervisors to review, just interesting stuff like hooking a spectacular fish (not that the guy could keep it). A golf game where someone fudged a score. A young woman picking her nose.
People being people before they were watched.