I'd imagine it's similar to the heuristic Amazon uses today with their A-Z Customer Guarantee.
If you request a lot of refunds for a single trip, or have a history of requesting refunds, your individual risk score goes up, and the hoops you jump through to get a refund increase.
Also for retail grocery stores now, loss prevention is already an issue.
Right now, a person can take an item off the shelve and hide it, leaving only security cameras and human personnel to watch for theft.
Adding in amazon's technology would be additional layers of defense.
With amazon tech, in addition to manually monitored cameras, you add AI monitored cameras, and sensors on shelves to detect an item has been taken.
Without Amazon's tech stores rely on staff members witnessing the item being hidden.
With Amazon's tech, the item is taken and marked for payment as soon as it's removed.
Honestly, yes. What I worry more about is how well the names of items on the receipt actually match up to the products. From the summer I worked as a grocery cashier, I can tell you that people often end up confused at items on the receipt that they actually bought.
Combine that with mistaken items on the receipt and some number of more trusting people will just assume it's just a weird labeling of something they did buy and move on.
Do you memorize all the time whether you grabbed two or three bags of chips or exactly how many cans of beer etc?
How do you prove you didn't buy something? Or will they just accept your word? If anyone can just say whatever, then people will just ask for refunds of stuff. Will they check the footage in each case? But maybe it can work in the US. It sure as hell won't work in many other countries, where people look for loopholes all the time.