British Law Enforcement Agencies Campaign to Employ Discriminatory Facial Recognition Systems

Police forces across the UK effectively campaigned to deploy a face scanning system acknowledged as discriminatory against women, young people, and individuals from minority ethnic backgrounds, following complaints that a less biased version produced fewer potential suspects.

How the System Works

British police use the national police database to carry out searches using historical face recognition. This process entails comparing a “probe image” of a suspect against a repository of over 19 million custody photos to identify potential matches.

Admitted Bias

The Home Office admitted last week that the system was flawed. This acknowledgment came after a review by the National Physical Laboratory (NPL) determined it misidentified people of Black and Asian heritage and females at much greater frequency than white men. The Home Office stated it “took steps on the findings”.

“It prompts the issue of whether facial recognition only becomes effective if users tolerate discrimination in race and gender. Operational ease is a weak argument for disregarding basic freedoms.”

Known Issue

Internal documents reveal that this discriminatory flaw has been recognized for over twelve months. Furthermore, law enforcement lobbied to reverse an initial decision that was intended to address the problem.

Police bosses were informed of the algorithmic discrimination in late 2024. The government-ordered NPL review found the system was more likely to produce incorrect matches for images depicting females, individuals of Black ethnicity, and those aged 40 and under.

A Reversed Decision

In response, the national police leadership body mandated that the accuracy setting required for potential matches be increased to a point where the disparity was significantly reduced.

However, this directive was overturned the following month following complaints from police that the modified technology was generating a lower number of “investigative leads”. Internal records indicate the higher threshold reduced the number of searches resulting in possible identifications from 56% to a mere 14%.

Profound Inequalities

Although the authorities refused to say what setting is now in operation, the latest independent review discovered the system could produce incorrect matches for women of Black heritage almost 100 times more often than for white women at specific configurations.

The Home Office stated on these results: “Our evaluation found that in a limited set of circumstances the algorithm is more likely to incorrectly include some population segments in its match reports.”

Balancing Utility and Fairness

Outlining the effect of the brief increase to the system's accuracy setting, the police records note: “This adjustment significantly reduces the impact of bias across protected characteristics of ethnicity, age and gender but had a significant negative impact on operational effectiveness”. The papers add that police units argued that “a once effective tactic now delivered outcomes 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 the relevant minister has labeled the tool as the “biggest breakthrough since DNA matching”.

Criticism from Advisors and Monitors

The chair of a police oversight board, head of the advisory panel for the national policing equality strategy, commented: “We observed scant discussion through race action plan meetings of the facial recognition rollout even with clear relevance with the strategy's goals.

“This disclosure demonstrate yet again that the pledges to combat discrimination policing has undertaken via the equality initiative are not being translated into wider practice. Independent assessments have warned that new technologies are being implemented in a context where racial disparities, weak scrutiny and faulty information gathering already persist.

“All deployment of this technology must meet strict national standards, be subject to external review, and prove it reduces rather than compounds racial disparity.”

Home Office Response

A Home Office spokesperson said: “We treat the conclusions of the report with utmost gravity and we have implemented changes. A new algorithm has been externally evaluated and procured, which has no statistically significant bias. It will be trialled in the coming months and will be undergo further assessment.

“The foremost aim is ensuring public safety. This gamechanging technology will support police to put criminals and rapists behind bars. There is officer review in every step of the process and no further action would be pursued without specialist personnel meticulously examining the output.”