Invisible Privacy | Online Privacy

http://catless.ncl.ac.uk/Risks/26.51.html#subj5

It works well and is getting better every day. I've read news stories of police catching people who get driver's licenses under fake names by running that database against itself to find duplicates. Just in the last couple weeks I saw a story about a guy who had to go through a guilty-until-proven-innocent process to get his license back: http://www.boston.com/news/local/massachusetts/articles/2011/07/17/man_sues_registry_after_license_mistakenly_revoked/?page=1

Since everybody has a license or a yearbook photo or friends tagging them on Facebook (which they can do whether or not you have an account), probably damn near everybody has a photo good enough for facial recognition software out there easily accessible to the government. And while usually that doesn't mean anything, in the last decade the government's been big on building big databases of everybody's activity, like with the warrantless wiretapping that went unpunished. This is something that can't be hidden from.
 

Simply stated, they measure distances from usually your eyes to another point on your face and see if the distances match up on a suspect's picture. A ball hat precludes a measurement up to the hairline and wrinkles on the forehead, glasses can obsecure the distance between the eyes, cheek gloss can obsecure cheek bone measurements, a breath rite strip will stop measurement of nose tips, and any facial hair plays havock, especially on the chin and below the nose. A smile in a picture will distort the biomeitricks....why do you think the DMV tells you not to smile in your driverslicense photo...or passport pictures; do it anyway. Dark eyeliner often prevents eye to eye or eye to ear (side view) measurements. That is because you can not really see where the eye starts. Yea...ski masks are great too.
 

Just wear a groucho marx type glasses and nose, that'll foil them!