Sign in a shop window, which reads: Non live Facial Recognition in Use We use this technology to help keep our customers, colleagues and stores safe. Engaging in suspected criminal activity on these premises may result in CCTV footage being reviewed, after an incident, using this technology to assist with investigations and reporting to police. Non live facial recognition is a form of biometric technology that is used after an incident has occurred. Non live facial recognition does not scan faces in real time. For more information, please see our Privacy Policy at Tesco.com or via the QR code below, or ask at the customer service desk.