A 15-year-old called Hillary Transue got three months for creating a spoof web page ridiculing her school's assistant principal. Ciavarella sent Shane Bly, then 13, to boot camp for trespassing in a vacant building. He gave a 14-year-old, Jamie Quinn, 11 months in prison for slapping a friend during an argument, after the friend slapped her. The judges were paid $2.6m by companies belonging to the Mid-Atlantic Youth Services Corp for helping to fill its jails. This is what happens when public services are run for profit.

It's an extreme example, but it hints at the wider consequences of the trade in human lives created by private prisons. In the US and the UK they have a powerful incentive to ensure that the number of prisoners keeps rising.