There was a famous case about their confessions obtained through torture. https://chicagotorture.org/reparations/history/ https://chicagotorture.org/reparations

There was a famous case about their confessions obtained through torture. https://chicagotorture.org/reparations/history/ https://chicagotorture.org/reparations/history/ That link doesn't mention the guns in mouths, but I remember that technique from at least one article about those Chicago police.