I guess DHS has figured out that bad guys are bad guys and existing expertise and technology probably will translate from fraud prevention to terrorism prevention.
Casinos have tried to use facial-recognition software to identify known cheats in real time, but with little success. Casino lighting is often dim, and a player who wants to conceal his identity can hide behind a hat, sunglasses or a false beard.
But in a few years, some say, iris-scan technology will be mature enough to use in gaming. Casinos might ask people to sit for a scan of the iris, which, like a fingerprint, has a unique pattern. That pattern would be transformed into a template to be matched against a database.
From Casinos to Counterterrorism (washingtonpost.com)
Data mining retinal scans and RFID flow to track betting sounds like a rather cool gig!