🔗 Share this article British Law Enforcement Agencies Campaign to Employ Biased Face Scanning Systems Law enforcement agencies across the United Kingdom successfully lobbied to deploy a face scanning system acknowledged as biased against women, young people, and members of ethnic minority groups, following complaints that a more accurate version generated a reduced number of investigative leads. The Technology in Practice 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 repository of over 19 million custody photos to find possible hits. Admitted Bias The UK interior ministry conceded last week that the system was biased. This admission came after a review by the National Physical Laboratory (NPL) found it misidentified people of Black and Asian heritage and females at significantly higher rates than Caucasian males. The Home Office stated it “had acted on the findings”. “It prompts the issue of whether this technology only becomes effective if users tolerate biases in race and sex. Operational ease is a weak argument for disregarding basic freedoms.” Known Issue Internal documents show that this bias has been known about for over twelve months. Furthermore, police forces argued to overturn an earlier ruling that was designed to address the problem. Police bosses were informed of the algorithmic discrimination in September 2024. The Home Office-commissioned NPL review concluded the system was had a higher probability to produce incorrect matches for photos of females, Black people, and those aged 40 and under. A Policy U-Turn In reaction, the national police leadership body ordered that the accuracy setting required for possible hits be raised to a point where the disparity was significantly reduced. However, this directive was reversed the next month after forces complained that the modified technology was producing fewer “investigative leads”. Internal records show the higher threshold cut the number of searches that yielded possible identifications from 56% to a just 14%. Profound Inequalities Although the authorities declined to specify what threshold is now in operation, the recent NPL study discovered the system could generate false positives for women of Black heritage almost 100 times more often than for Caucasian women at specific configurations. The ministry stated on these findings: “Our evaluation identified that in a specific scenarios the algorithm is more likely to wrongly flag some demographic groups in its search results.” Operational Effectiveness vs. Bias Describing the impact of the temporary raise to the system's accuracy setting, the police records state: “The change greatly lessens the impact of discrimination across protected characteristics of race, generation and sex but had a substantially detrimental effect on operational effectiveness”. The papers further note that police units complained that “a once effective tactic now delivered results of limited benefit”. Broader Rollout Plans Meanwhile, the government has opened a two-and-a-half-month consultation on its plans to widen the use of biometric scanning systems. Policing minister Sarah Jones has described the tool as the “most significant advance since genetic fingerprinting”. Criticism from Advisors and Monitors Abimbola Johnson, head of the advisory panel for the police race action plan, commented: “There was scant consideration through equality strategy sessions of the facial recognition rollout even with clear relevance with the plan’s concerns. “This disclosure demonstrate once again that the pledges to combat discrimination the police has undertaken through the equality initiative are not being translated into broader operations. Independent assessments have warned that new technologies are being rolled out in a landscape where ethnic inequalities, weak scrutiny and faulty information gathering already persist. “All deployment of this technology must meet rigorous official guidelines, be independently scrutinised, and prove it diminishes rather than compounds racial disparity.” Official Statement A Home Office spokesperson stated: “We treat the findings of the study seriously and we have implemented changes. A updated software has been independently tested and acquired, which has no statistically significant bias. It will be trialled early next year and will be subject to further assessment. “The foremost aim is ensuring public safety. This gamechanging technology will assist officers to apprehend and prosecute offenders. There is human involvement in each stage of the process and no further action would be taken without specialist personnel carefully reviewing the results.”