Airport Security

Sorry if this is off topic. Ignore this if you wish.

The big topic on the news and on the internet recently has been the screening that goes on at airports. It makes me wonder why there are no systems that use facial recognition to pull up information on each and every passenger going onto a flight.

Faces could be scanned during ticketing and check in and info provided at the ticket desk (ie. name, ID, etc.) could be included to look up each and every passenger that will be travelling. By the time they get to the security checkpoint, passenger profiles could be available to screeners. Anyone not found in the system, would be filtered through a "higher" level of screening. Those that are in the "system" would be directed to the "standard" level of screening.

I'm wondering why this kind of system does not exist today.

References:
http://eyetrackingupdate.com/2010/01/14/accurate-biometric-needed-for-screening-airport-security/

http://www.securitymanagement.com/news/british-airport-tests-facial-recognition-security-gates-005635

http://www.militaryaerospace.com/index/display/article-display/162111/articles/military-aerospace-electronics/volume-13/issue-11/electro-optics-supplement/news/facial-recognition-takes-off-in-airport-security.html