Sainsbury’s resumes live facial recognition in East Dulwich with no shopper opt-out

The system had been paused after the mistaken identity case. Sainsbury’s declined to comment on the record and referred data privacy questions to Facewatch, the company behind the technology. Facewatch confirmed to TechRadar that the pause is over and live alerts have resumed. The cameras are now back online.

TechRadar’s reporter visited the East Dulwich store this week and asked whether it was possible to avoid having biometric data processed. A security guard appeared surprised by the request. A small sign next to the sliding glass doors was easy to miss, while a larger board inside offered little substantive detail. Full information required scanning a QR code that led to Facewatch’s privacy policy, which the reporter could only access because of a charged smartphone with mobile data.

At the entrance, cameras map facial features into biometric measurements and check them against a watchlist of suspects. Facewatch does not sell customer data. If there is no match, the biometric calculation is deleted in milliseconds, though photographic crops of detected faces are held for up to seven days for retroactive incident review, according to the company.

UK data privacy law, including UK GDPR, includes a right to be informed when personal data is collected and processed. Retailers argue that tracking crime is a legitimate interest, so they bypass customer consent requirements. Notices at the supermarket entrance inform shoppers that scanning is underway rather than asking permission.

In London, a shopper who objects may be able to walk away and shop elsewhere. Supermarkets are essential national infrastructure, and in rural areas or places without alternatives, telling customers to choose another shop is not a realistic option, TechRadar reported.

The consequences of a false match were not theoretical for Matt Arnold. This summer, he was wrongfully accused of being a shoplifter and escorted out of the East Dulwich store. Arnold told the BBC that what upset him was thinking that this is what the future could be, with people listening to what a machine tells them to do without thinking about the consequences.

Facewatch’s technology is not limited to Sainsbury’s. Facewatch lists Sports Direct, Budgens, Costcutter and B&M as customers on its website. An increasing number of police forces across the UK are adopting live facial recognition despite persistent legal challenges, according to TechRadar.

Big Brother Watch, a UK civil liberties group, regularly intervenes to help innocent shoppers remove their details from Facewatch’s database after they are wrongly flagged. The group says some people are not so lucky and are blacklisted from all the stores in their local area. Jasleen Chaggar, senior legal and policy officer at Big Brother Watch, said shoppers are being subjected to airport-style security just to buy a pint of milk. She argued the system is indiscriminate by design, meaning every customer is treated with suspicion.

Facewatch has defended the technology as an essential safeguard. In an email to TechRadar, a spokesperson said campaign groups are highlighting the rights of consumers while overlooking a shop worker’s right to feel safe at work. The spokesperson added that giving a shop worker advance warning that someone known to have violently offended has entered their store can give them confidence and precious time.

Industry indicators cited by Facewatch estimate annual losses from shoplifting have reached £2.2 billion. Shoplifting harms supermarket profits, and the company argues the technology is needed to protect staff and stores.

Editor's Summary

Sainsbury’s has resumed live facial recognition at its East Dulwich store after a pause prompted by an innocent shopper’s wrongful ejection. The case highlights the tension between retailer security claims and UK privacy rights, as Facewatch’s technology spreads across supermarkets and police forces with little practical ability for customers to opt out.