Late one night in October 2015, North Dakota prisons chief Leann Bertsch met Karianne Jackson, one of her deputies, for a drink in a hotel bar in Oslo, Norway. They had just spent an exhausting day touring Halden, the maximum-security facility Time has dubbed “the world’s most humane prison,” yet neither of them could sleep.

https://www.motherjones.com/crime-justice/2017/07/north-dakota-norway-prisons-experiment/