2) DNA: Matching a suspect’s DNA to a crime-scene sample used to mean waiting up to 60 days for lab results. IntegenX recently released RapidHIT technology, which compares DNA in 90 minutes—fast enough to nail a suspect during interrogation. The two-by-two-foot scanner packs a lab’s worth of chemical analyses onto a single disposable microfluidic cartridge.
3) Iris: An iris scan requires suspects to stare directly into a nearby camera, making it all but useless for criminal investigations. But it’s a foolproof approach to authentication, and nearly any consumer-grade camera can capture the unique patterns in the eye. Schools, prisons, and companies (including Google) already use iris scans for security.
4) Voice: Though voice recognition is largely a commercial tool—banks such as Barclays use it to verify money transfers—vocal-pattern matching also catches crooks. Within 30 seconds of phone conversation, the system created by Nuance Communications can build a unique voice print and then run it against a database of prints from confirmed fraudsters.
(from Popular Science)