It will flag clients for "suspicious" behavior, compare your face with known shoplifters in the last 10 years, and check if you are on the FBI most wanted list.
You'll be arrested before having picked up a single item.
When it is installed and working it could be part a "The Culture" like utopia. But even if it has an error rate as low as 0.01% and ruins the lives and careers of people because of technical mishaps it can make their lives a dystopic nightmare.
You'll be arrested before having picked up a single item.