Nick Yarris spent 22 years on death row. At one point, he even escaped. But then, right before he was slated to be executed, DNA evidence proved he was innocent. Is the death penalty justified? Can a just society execute people? Are you more likely to be executed if you kill a white person? And why do most death sentences come from a tiny number of American counties?     ----   Power Corrupts is written and narrated by Brian Klaas. The executive producer and sound editor is George McDonagh.