My daughter's friend works in a large 24 hour grocery store and people regularly fill up a cart and try to take off. At night when there's only a few working and 20 lanes to sneak through, security is difficult.
I guess I don’t understand why cameras with security watching in real time doesn’t work- we had people try to walk out with big ticket items 30 years ago when I worked in retail. Shoplifting is not new, you would think with all the high tech things now there would be something that worked better than checking everyone at the door.