Along with fingerprints and mug shots, the New York City Police Department is now taking photographs of the irises of crime suspects.

The NYPD says the images will be used to help avoid cases of mistaken identity. The process takes about five seconds. Every suspect will be scanned again using a handheld device shortly before they are arraigned to make sure the irises match.

Police say the software, handheld device and cameras cost about $23,800 each, and 21 systems will be used around the city.
From NYPD Begins Using Iris Scans On Suspects CBS New York News, Sports, Weather, Traffic and the Best of NY Rest there.

Comments on the story are running a wee bit toward the negative side. Guess I'm more wondering how many cases of mistaken identity there are and how that works.