Seems like common sense to me and it seems to work.
A study by the Grant Sawyer Center for Justice Studies at the University of Nevada, Reno of recidivism rates across the United States showed that Arizona has the nation's lowest rate of recidivism, at only 24.5 percent, while states with higher rates were California (53.4 percent), Alaska (66 percent), and Utah (64 percent).
One Nevada district attorney said the states with higher recidivism rates "have pleasant prisons".[39]
Reckon many people would like to see this sort of thing in the UK...
...which is why you will not see Accyweb politicos anywhere near this thread!