Source: @The New York Times
At some drive-throughs, McDonald’s has tested technology that can recognize license-plate numbers, allowing the company to tailor a list of suggested purchases to a customer’s previous orders, as long as the person agrees to sign away the data.
At some stores, Bluetooth devices now track shoppers’ movements, allowing companies to send texts and emails recommending products that customers lingered over but did not buy. And a number of retailers are experimenting with facial recognition tools and other technologies — sometimes known as “offline cookies” — that allow businesses to gather information about customers even when they are away from their computers.
https://www.nytimes.com/2019/10/22/business/mcdonalds-tech-artificial-intelligence-machine-learning-fast-food.html