A think tank has criticised prison drug services for falling short of 'even minimum standards' and called on the government to take action.

The UK Drug Policy Commission has published a report, Reducing Drug Use, Reducing Re-offending, which accuses the government of focusing on raising the number, instead of the quality, of drug programmes available to offenders.

It says prison drug services are inadequate due to problems in identifying users, adherence to guidance, continuity of care within the prison system and community services.

Commission chair Dame Ruth Runciman said: "The review demonstrates how far the prison system needs to travel if it is to deliver a standard sufficient to make a sustained impact on offenders' problem drug use."

The government this week announced it is increasing funding for prison drug misuse treatments to£43m per year in 2011-12.