Durham's police force was criticised by privacy campaigners over the 'crude' nature of the data it was using to help predict which offenders were likely to commit more crimes.

An investigation by digital rights and privacy group Big Brother Watch (BBW) revealed that Durham Constabulary had augmented police data underpinning its Harm Assessment Risk Tool (HART) with Experian's Mosaic dataset. 

The dataset classifed Britons into 66 groups such as 'disconnected youth' and 'Asian heritage' and were annotated with lifestyle details such as 'heavy TV viewers', 'overcrowded flats' and 'families with needs'.

Such categories were ‘really quite offensive and crude’, according to BBW's Silkie Carlo. Durham Constabulary later said it stopped including Mosaic in its dataset.

The Harm Risk Assessment Risk Tool scored offenders and placed them into three categories indicating they were at low, moderate or high-risk of reoffending. Those deemed to be at moderate risk of reoffending being offered the chance to go into a rehabilitation programme called Checkpoint as an 'alternative to prosecution.'