Shadow justice secretary Sadiq Khan criticised Chris Grayling's plans for privately-contracted probation services:
Payment by results in criminal justice is untested, and the Tory-led Government are taking a reckless gamble with public safety.
Pilots were already under way to see if payment by results worked and to ensure any problems were ironed out before being rolled out.
The new Justice Secretary, Chris Grayling, is demonstrating breathtaking arrogance in choosing to ignore the pilots.
Mr Khan said that every Probation Trust in the country was rated either good or exceptional by the Government in 2011, and warned that Mr Grayling's proposals risked replacing them with private firms such as G4S.
Rushing into payment by results is a danger to the offenders who might not receive the rehabilitation support they require, and to the safety of communities up and down the country.
And the Work Programme is showing that experienced and dedicated small and local providers won't be doing the delivery, but will be crowded out by the usual large private sector companies.
More top news
A man caught with dozens of turtles inside his pants is to face a court under the US justice system.
Too many family homes are being built around the size of a bathroom too small for people to live in them comfortably, a report says.
The numbers of female officers in police forces must be boosted further as they tackle the "changing face of crime", Theresa May will say.