🔗 Share this article British Law Enforcement Agencies Lobbied to Use Discriminatory Face Scanning Systems Law enforcement agencies across the UK successfully lobbied to deploy a face scanning system known to be biased against females, youths, and individuals from ethnic minority groups, after complaining that a less biased version produced a reduced number of investigative leads. How the System Works UK forces use the national police database to conduct retrospective facial recognition searches. This procedure entails comparing a reference photograph of a person of interest against a repository of over 19 million mugshots to find potential matches. Acknowledged Discrimination The Home Office conceded last week that the system was flawed. This acknowledgment followed a review by the National Physical Laboratory (NPL) found it incorrectly matched Black and Asian people and women at significantly higher rates than Caucasian males. The Home Office stated it “had acted on the findings”. “This raises the issue of whether facial recognition only becomes effective if users tolerate discrimination in race and gender. Operational ease is a weak argument for overriding fundamental rights.” Known Issue Official papers reveal that this discriminatory flaw has been known about for more than a year. Furthermore, law enforcement argued to overturn an earlier ruling that was designed to mitigate the problem. Police bosses were notified of the algorithmic discrimination in late 2024. The Home Office-commissioned NPL review found the system was had a higher probability to suggest incorrect matches for photos of women, Black people, and those under 40 years old. A Policy U-Turn In reaction, the National Police Chiefs’ Council (NPCC) ordered that the accuracy setting required for potential matches be increased to a level where the bias was significantly reduced. However, this decision was overturned the next month following complaints from police that the modified technology was producing fewer “investigative leads”. NPCC documents indicate the stricter setting reduced the number of searches resulting in possible identifications from 56% to a mere 14%. Profound Inequalities Although the authorities declined to specify what threshold is now in operation, the latest NPL study found the system could produce incorrect matches for women of Black heritage nearly a hundred times more often than for white women at certain settings. The ministry commented on these findings: “Our evaluation found that in a limited set of circumstances the software is more likely to incorrectly include some population segments in its match reports.” Balancing Utility and Fairness Describing the impact of the brief increase to the system's confidence threshold, the NPCC documents state: “This adjustment greatly lessens the impact of discrimination across protected characteristics of ethnicity, age and gender but had a substantially detrimental effect on operational effectiveness”. The documents further note that forces argued that “a once effective tactic returned results of limited benefit”. Wider Implementation Proposals Meanwhile, the government has opened a ten-week public review on its proposals to expand the use of biometric scanning systems. The minister for police Sarah Jones has labeled the tool as the “biggest breakthrough since genetic fingerprinting”. Expert and Oversight Concerns The chair of a police oversight board, head of the independent scrutiny and oversight board for the police race action plan, said: “There was very little discussion in equality strategy sessions of the technology deployment despite obvious cross-over with the strategy's goals. “These revelations show yet again that the pledges to combat discrimination the police has undertaken via the race action plan are not being translated into wider practice. Our reports have cautioned that innovative tools are being implemented in a landscape where ethnic inequalities, inadequate oversight and faulty information gathering continue to exist. “Any use of this technology must meet strict national standards, be subject to external review, and demonstrate it reduces rather than exacerbates ethnic bias.” Official Statement A Home Office spokesperson stated: “We treat the findings of the study seriously and we have implemented changes. A new algorithm has been independently tested and acquired, which has no statistically significant bias. It will be tested in the coming months and will be subject to further assessment. “The foremost aim is ensuring public safety. This revolutionary tool will support officers to apprehend and prosecute offenders. There is human involvement in each stage of the procedure and no arrest or charge would be pursued without specialist personnel meticulously examining the results.”