When the system worked properly, random items would be scanned (about 3) to determine if everything was rung up. A law of averages but when it worked properly, some items were a red flag (not mentioned).
Theft is so widespread this became essential.
Until it was virtually defeated.
You would not believe the retail theft that occurs on a daily basis. At all types of stores, not just Walmart. Grocery stores, Hobby Lobby, Lowe’s, Home Depot, etc.
I believe it, but that’s not my problem. Our legal system requires the accuser to prove guilt, not the defendant to prove innocence.