Treating a common behavioural disorder in convicted criminals could have a major impact on reoffending, a study suggests.
Criminal behaviour in people diagnosed with attention deficit hyperactivity disorder (ADHD) falls by about a third when they are on medication, research from Sweden shows.
Translated to the prison population, similar treatment could have a dramatic effect, experts believe.
Around four per cent of children in the UK and half as many adults are believed to suffer from the disorder, which is characterised by over-activity, impulsivity, aggression, short temper and disorganised thinking.
Studies suggest that anything from ten per cent to 40 per cent of prison inmates have the disorder, but few are diagnosed or treated.