Of course, prison works to the extent that those who are incarcerated cannot commit further crimes while they are banged up.

ECONOMIST: Prisons

Prison works to the extent that anyone in prison cannot commit a crime on the outside while they're in - absolutely fine.

BBC: News Online

Whether or not prison works as a crime-fighting tool, how much further down the road of ever more frequent imprisonment can America go?

ECONOMIST: Prisoners

It's what Michael Howard meant when he said that "prison works".

BBC: News - Today - The search for justice

"I believe prison works and I believe it works because it actually takes young offenders from the chaotic lifestyle they've been in and puts them into somewhere where work can be done, " she said.

BBC: Legal Aid, Sentencing and Punishment of Offenders Bill

Even the untrained art critics, that were the prison staff, all saw an early talent and viewed his works at the San Quentin Prison Hobby Gift Store.

FORBES: The Mastery of The Escape Artist

He spends his days reading academic works in his prison cell.

BBC: Abdullah Ocalan: A bridge between Kurds and Turks?

The former governor now works as a deputy governor at another prison.

BBC: Prison chief's horror over raid

The three who carried out building works were sentenced to four years in prison, while the other man received a sentence of two-and-a-half years.

BBC: L'Aquila quake: Italy court convicts four

Perhaps Mr Moriarty had in mind Jagat Gauchan, the minister for physical planning and works, who once served a year in prison in connection with the attempted murder of a journalist.

ECONOMIST: The king's autocratic methods worsen Nepal's crisis

But by law, a private prison must also have a controller who is a government employee and works to the Justice Secretary.

BBC: Charity makes bid to run prisons