when I worked at a grocery store for a bit (until a year go), we had that kind of system alongside the regular and self checkouts. It was interesting to see as I had never heard of it before, but it was very fast when it worked. That being said, almost nobody actually used it, and whenever the random checks happened it was almost always when someone had bought more items than usual (not sure if that actually triggers anything or if it was just coincidence) and the system for looking through everything was frustratingly slow for both me and the customers. I feel like the scanners are a great idea, but the theft-deterrent system for it could use a rethink, though Im not sure what exactly could best replace it