For the last couple of months, people arriving to and departing from Milwaukee County's jail have had their eyes scanned. That's in addition to having their fingerprints taken during the booking process.
Commander Aaron Dobson says the scans are an extra step to ensure proper identification. "No two people have the same iris."
Dobson and his staff showed the scanning devices to the media last week. The scanners are about the size of a digital camera. They're hooked up to a computer, which checks the image of a person's iris against others in a national database.