What is the best way to rehabilitate offenders? The previous government has been criticised for increasing the prison population, and Justice Secretary Ken Clarke will today announce the new government's overhaul of the penal system.

Chief executive of St Giles Trust Rob Owen, and director of right-leaning think-tank Civitas, David Green, discuss the role of prison in society and how to strike the right balance between community sentencing and custodial sentences.

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