For a sense of where entry security is heading, check out this Wired blog post on technologies that will be able to identify people by their physiology – from a distance, at that. Federal agencies are pumping tax dollars into biometric scanning that keys on various body parts, like the ears, odor or heartbeat, as someone approaches.
There will be, Wired reports, “Cell phones that can identify you by how you walk. Fingerprint scanners that work from 25 feet away. Radars that pick up your heartbeat from behind concrete walls and more. This is a pretty engrossing preview of where biometric security scanning is heading.