I found this to be interesting - take the various biometric security measures that are being installed, and the supposed ways that hi-tech criminals/spies get around them:

Eyeballs, a severed hand, or fingers carried in ziplock bags. Back alley eye replacement surgery. These are scenarios used in recent blockbuster movies like Steven Spielberg's "Minority Report" and "Tomorrow Never Dies" to illustrate how unsavory characters in high-tech worlds beat sophisticated security and identification systems.

However, it may take nothing more than a very low-tech spoofing attack - play-doh, anyone?

Fingerprint scanning devices often use basic technology, such as an optical camera that take pictures of fingerprints which are then "read" by a computer. In order to assess how vulnerable the scanners are to spoofing, Schuckers and her research team made casts from live fingers using dental materials and used Play-Doh to create molds. They also assembled a collection of cadaver fingers.

In the laboratory, the researchers then systematically tested more than 60 of the faked samples. The results were a 90 percent false verification rate.

I guess that's why you need the boring human security guard - they can look for those kinds of scams.