Scans of an inmate’s eyes appear on a computer monitor attached to the Inmate Recognition and Identification System (IRIS) scanner, Wednesday Feb. 24, 2010 at the Story County Jail in Nevada, Iowa. Dozens of prisons across the country are installing eye scanners that identify inmates to avoid mistakes like this week’s accidental release of a Baltimore prisoner

via Iris scans may prevent mistaken release of inmates – AP News Wire, Associated Press News – Salon.com.