UK's Durham Police Halts Reoffending-Prediction AI 'HART' in 2021 Over Bias Concerns

A machine-learning tool called HART (Harm Assessment Risk Tool), which the UK's Durham Constabulary used to rate the reoffending risk of arrestees on a three-tier scale, was shut down in 2021 over problems including bias rooted in residential data and an inability to keep it updated — and the case is now under renewed scrutiny. The tool assessed the likelihood of reoffending over the next two years as "high," "medium," or "low," drawing on prior criminal history, age, gender, and postcode.