"If only you could see what I've seen with your eyes ..."

Slightly wacky instance of biometrics - tracking people using their scent, much like the Stasi did, and now Germany is doing again. How amazing that history repeats, that we resort back, in times of desperation, to the same bad habits that we only shortly ago were demonising. Besides the civil-rights issues relating to biometrics, one of the flaws with the system that seems to stand out most is biotheft:

"When thieves cannot get access to secure properties, there is a chance that the thieves will stalk and assault the property owner to gain access. If the item is secured with a biometric device, the damage to the owner could be irreversible, and potentially cost more than the secured property. In 2005, Malaysian car thieves cut off the finger of a Mercedes-Benz S-Class owner when attempting to steal the car." -- Wikipedia

This was beautifully portrayed in Minority Report when Tom Cruise's character uses a pair of standalone human eyes (his old ones) to fool an eye scanner.

Image by Clearly Ambiguous