You do the crime, you do the time… or a third of it if you’re part of the early release scheme.
The move has been controversial since it was first introduced two years ago - but public anger has been reignited over the scheduled release of two men convicted of killing PC Andrew Harper.
Prime Minister Andy Burnham is now under huge pressure to ensure they remain behind bars - but is there anything he can actually do? And why was this scheme introduced in the first place?
Niall Paterson is joined by home affairs commentator and former adviser to Yvette Cooper, Danny Shaw.
Have you got a question for Niall? Email us: why@sky.uk
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