The cruelties and systemic failures of America’s prisons are well known, and prisons and detention centres are now considered a last resort for disciplining children. As community supervision grows, electronic monitoring spreads: 120,000 people wore an ankle bracelet in 2005, 200,000 in 2012, and a larger share of youth than adults under correctional supervision wear them. Zora J. Murff photographs the experiences of young people in the juvenile justice system and the role of images in the correctional system: how images define those deemed criminals. Introduction by Pete Brook of Prison Photography.