🔗 Share this article British Police Forces Lobbied to Use Biased Facial Recognition Technology Police forces across the UK successfully lobbied to use a face scanning system known to be biased against females, youths, and members of ethnic minority groups, after complaining that a more accurate version generated a reduced number of investigative leads. How the System Works British police utilize the police national database (PND) to carry out searches using historical face recognition. This process entails matching a “probe image” of a person of interest against a database of over 19 million mugshots to identify potential matches. Admitted Bias The UK interior ministry conceded last week that the system was flawed. This admission followed a review by the National Physical Laboratory (NPL) determined it incorrectly matched Black and Asian people and women at significantly higher rates than Caucasian males. The ministry stated it “had acted on the findings”. “It prompts the issue of whether facial recognition only becomes effective if users tolerate biases in race and gender. Convenience is a poor argument for overriding fundamental rights.” Long-Standing Problem Official papers reveal that this discriminatory flaw has been known about for more than a year. Furthermore, police forces lobbied to reverse an initial decision that was designed to mitigate the problem. Senior officers were notified of the algorithmic discrimination in September 2024. The Home Office-commissioned NPL review found the system was had a higher probability to suggest false positives for photos of females, individuals of Black ethnicity, and those under 40 years old. A Policy U-Turn In reaction, the National Police Chiefs’ Council (NPCC) mandated that the accuracy setting required for potential matches be raised to a point where the bias was greatly diminished. However, this decision was reversed the following month after forces complained that the modified technology was producing fewer “useful lines of inquiry”. NPCC documents indicate the higher threshold cut the number of queries that yielded possible identifications from over half to a mere 14%. Profound Inequalities Although the authorities refused to say what threshold is now in operation, the recent independent review discovered the system could produce incorrect matches for women of Black heritage almost 100 times more often than for white women at certain settings. The Home Office commented on these findings: “Our evaluation identified that in a specific scenarios the algorithm is has a greater tendency to wrongly flag some population segments in its search results.” Operational Effectiveness vs. Bias Describing the effect of the brief increase to the system's confidence threshold, the police records state: “This adjustment significantly reduces the effect of discrimination across legally safeguarded attributes of race, age and sex but had a significant negative impact on police efficiency”. The papers add that forces argued that “a once effective tactic returned results of limited benefit”. Wider Implementation Proposals Meanwhile, the UK administration has opened a two-and-a-half-month consultation on its proposals to expand the use of biometric scanning systems. The minister for police Sarah Jones has described the technology as the “most significant advance since DNA matching”. Expert and Oversight Concerns The chair of a police oversight board, head of the advisory panel for the police race action plan, commented: “We observed very little consideration in equality strategy sessions of the facial recognition rollout even with obvious cross-over with the strategy's goals. “These revelations show yet again that the anti-racism commitments policing has made via the race action plan are not being translated into wider practice. Our reports have cautioned that new technologies are being implemented in a landscape where racial disparities, inadequate oversight and poor data collection continue to exist. “Any use of this technology must meet strict national standards, be subject to external review, and demonstrate it diminishes rather than compounds ethnic bias.” Official Statement A Home Office spokesperson stated: “We takes the findings of the study seriously and we have implemented changes. A new algorithm has been externally evaluated and acquired, which has demonstrated no measurable discrimination. It will be trialled early next year and will be undergo further assessment. “The foremost aim is protecting the public. This gamechanging technology will assist police to put criminals and rapists behind bars. There is human involvement in every step of the procedure and no further action would be pursued without specialist personnel carefully reviewing the results.”