Some 22 million Americans struggle with drug or alcohol dependency, but only 3 million have sought formal treatment.

FORBES: Reinventing Rehab

Speaking about the programme at the time, Prime Minister David Cameron referred to 120, 000 families who were plagued by drug addiction, alcohol dependency and crime.

BBC: Government 'misrepresenting' the poor, say churches

The social costs of family breakdown, welfare dependency, educational failure, crime, anti-social behaviour, drug and alcohol addiction are impossible to calculate.

BBC: In full: Cameron's economy speech