The Telegraph
If you happen to miss the camera above the entrance, the sign will inform you. “FACIAL RECOGNITION & CCTV IN OPERATION ON THIS SITE” it declares in black letters as the automatic door slides to one side.
When you enter, the camera scans the contours of your face, instantly cross-referencing it against a database of known shoplifters.
Since you are a law-abiding citizen, the computer finds nothing. The video footage and any associated biometric data is instantly deleted. It does this hundreds of times a day, as customers filter in and out of the shop.