Ahh, main one i was talking about where the video camera's. They "seem" to be the most common. Although the retinal scans, are appearing in Airports now. From what i understand of the video camera's. They match up the facial structure, with ones that are in a database. That is where, the plastic surgery would come in.

I agree with this to a point:
The long term impact has yet to be recognized, but as long as the laws of the land follow suit (i.e. personal privacy, 4th Amendment, reasonable doubt)...there should be nothing to worry about for honest citizens...

I am an honest citizen, but I sure don't like the idea, of a camera finding out who I am. On a busy street, Mall, Grocery Store, whatever. I feel that it is an invasion of privacy. Besides, the more information, that is collected of you, the easier it is for "Bad Guys" to steal your identity. And it is easy enough as it is.