According to information released under Freedom of Information laws, the Metropolitan Police's automated facial recognition (AFR) technology has a 98 per cent false positive rate.
A report by Big Brother Watch called for use of facial recognition software by the police to be abandoned.
Big Brother Watch's report focused on the latter, which it said breaches human rights laws as it surveils people without their knowledge and might dissuade them from attending public events.
Wired revealed earlier this month that during the UEFA Champions League Final last June, there were 2,470 alerts of possible matches, 2,297 false positives and 173 accurate identifications. "Because of the poor quality, it was identifying people wrongly".
Technological advances in the last 20 years have rapidly increased the ability of online systems to identify individuals.
It was even used by the Metropolitan Police to scan for people on a mental health watch list at the 2017 Remembrance Sunday event in London.
The group described this as a "chilling example of function creep" and an example of the risky effect it could have on the rights of marginalised people.
The software used by South Wales Police and the Metropolitan Police has not been tested for demographic accuracy, but in the United States concerns have been raised that facial recognition is less reliable for women and black people.
"I will also carefully consider the reports recently issued by Civil Society, Big Brother Watch in the United Kingdom and the Electronic Frontier Foundation in the U.S.".
SWP - which has used AFR at 18 public places since it was first introduced in May 2017 - has fared only slightly better. Of the remaining 234, there were 110 interventions and 15 arrests. What protections are there for people that are of no interest to the police?
"On a much smaller number of occasions, officers went and spoke to the individual. realised it wasn't them, and offered them the opportunity to come and see the van". "I therefore welcome Baroness Williams' recent confirmation of the establishment of an oversight panel which I, alongside the Biometrics Commissioner and the Surveillance Camera Commissioner (SCC), will be a member of".
Elizabeth Denham also disclosed that she is investigating the proportionality of forces holding 19 million images on the police national computer of people photographed when taken into custody. Despite this, the force is planning seven more deployments this year. How does the use of FRT in this way comply with the law? Big Brother Watch said that given the Home Office had forked out £2.6m to SWP for its AFR kit, they were also "hardly a convincing reason".